Why Is My W-2 Box 1 Lower Than My Salary?

What Box 1 Actually Reports (and Why It Isn't Your Salary)

Box 1 is labeled "Wages, tips, other compensation," which reads like gross pay but is not. It reports federal taxable wages: what is left after every deduction your employer took before calculating federal income tax withholding. If your offer letter says $85,000 and Box 1 says $73,212, nothing has gone missing. The difference went into your retirement plan, your health premiums or a spending account, and it is still your money.

Here is that example line by line. Start with $85,000 of gross wages. Add $312 of imputed income for group-term life coverage over $50,000, which raises taxable wages rather than lowering them. Subtract $8,500 of traditional 401(k) deferrals and $3,600 of pre-tax medical premiums. Box 1 lands at $73,212.

The check runs in reverse too. Take Box 1, add back the Box 12 code D amount, the Box 12 code W amount, and your Section 125 premiums, and you should land within a dollar or two of the year-to-date gross on your final pay stub. If you cannot close that gap, something on the pay stub is not what you assumed it was.

Two figures on the form move nothing at all. Box 12 code DD reports what employer-sponsored health coverage cost in total, and it is there for information only: it reduces no box and it is not taxable. Box 12 code AA reports designated Roth contributions, which come out after federal income tax and so leave Box 1 exactly where it was.

Which Deductions Hit Which Box

Deductions sort into four groups, and knowing which group an item belongs to answers almost every "my W-2 looks wrong" question.

Some deductions reduce Box 1 only. Traditional 401(k), 403(b) and 457 elective deferrals are exempt from federal income tax but not from Social Security or Medicare tax. They lower Box 1 and leave Boxes 3 and 5 untouched, which is why those two boxes are usually the higher pair.

Others reduce Boxes 1, 3 and 5 at once. Section 125 medical, dental and vision premiums, health FSA contributions, dependent care FSA contributions, HSA money run through payroll, and qualified commuter or parking benefits all come out before both income tax and FICA. Per dollar, these save you the most.

A third group reduces nothing. Roth 401(k) and Roth 403(b) contributions, after-tax deductions such as union dues or garnishments, and the Box 12 code DD health coverage figure never lower taxable wages anywhere on the form.

And one group moves the number the other way. Imputed income raises Boxes 1, 3 and 5. Group-term life coverage over $50,000 (Box 12 code C), domestic partner health coverage, and personal use of a company car are the common ones, and they often turn up on a W-2 without the employee ever having spotted them on a pay stub.

One trap worth naming: HSA money you contributed directly to your own account, outside payroll, is not in Box 12 code W and does not reduce Box 1. You claim it as an above-the-line deduction on Form 8889 and Schedule 1 instead, and unlike payroll HSA contributions it saves no FICA at all.

Why Box 3 Stops and Box 5 Keeps Going

Social Security wages are capped. For 2026 the wage base is $184,500, so Box 3 can never exceed that figure no matter what you earned. Medicare wages have no cap, so Box 5 keeps climbing. Once your FICA wages pass the wage base, Box 5 is larger than Box 3 by exactly the amount you earned above it, and that gap is correct rather than an error.

The Additional Medicare Tax adds a second wrinkle. A further 0.9% applies to wages above $200,000 for single and head of household filers, $250,000 for joint filers, and $125,000 for married filing separately. Employers withhold it on wages over $200,000 regardless of your filing status, because they cannot see your spouse's income. It changes Box 6, never Box 5, and any over-withholding is settled on Form 8959 when you file.

Job changers hit a separate version of the cap. The wage base applies per employer, so two employers in one year can each withhold Social Security tax up to $184,500 of wages. You do not ask either one for a corrected W-2. You claim the excess as a credit on Schedule 3 of Form 1040.

When Box 16 Doesn't Match Box 1, and What to Do If Nothing Reconciles

Most states start from federal taxable wages, so Box 16 equals Box 1. Two states are the usual reason it does not. Pennsylvania taxes elective deferrals to an employer plan at the time of contribution and treats dependent care coverage as compensation, so Box 16 comes out higher than Box 1 by roughly your 401(k) plus dependent care FSA. New Jersey excludes 401(k) contributions the way federal rules do, but taxes 403(b), 457 and 414(h) contributions, so only that portion is added back. Multi-state allocations, state paid family leave programs, and the local wage taxes in Boxes 18 through 20 can move the number as well. Differences here are usually correct.

If the boxes still refuse to reconcile, work through this order before calling payroll:

1. Check the pay date, not the pay period. A check dated in early January counts in the new year even when it covers December work, which shifts one paycheck out of the W-2 you are holding.
2. Look for a mid-year benefits change. A new health plan, a spending account election, or a 401(k) rate change in July means the annual figure is not twelve equal months.
3. Hunt for imputed income you did not know about. Group-term life over $50,000 and domestic partner coverage are the two that surprise people most.
4. Confirm which retirement bucket you used. Roth deferrals feel identical on a pay stub and do nothing to Box 1.
5. Once the figures check out, run Box 1 through the AGI Calculator or the Tax Refund Estimator to see where the year actually lands.
6. If a real difference remains, ask your employer for a Form W-2c. Only the employer can correct a W-2, and they file the correction with the Social Security Administration.

One more 2026 change worth knowing: catch-up contributions for employees who earned more than $150,000 in the prior year must now be made on a Roth basis. If you are 50 or older and high-earning, the catch-up portion of your deferrals no longer reduces Box 1 the way it used to. The Catch-Up 401(k) Calculator covers the limits in detail.

These figures are estimates for planning and reconciliation only, not tax or legal advice. The calculator models the common W-2 box adjustments and does not cover nonqualified deferred compensation, S corporation shareholder health premiums, statutory employees, third-party sick pay, multi-state wage allocation, or local wage taxes. Only your employer can issue a corrected Form W-2c. Confirm your situation with your payroll department or a tax professional before filing.