Box 1 on your W-2 is your federal taxable wages for the year — the number your employer reports to the IRS as the pay subject to federal income tax. It is usually lower than your gross pay because pre-tax deductions like traditional 401(k) contributions and cafeteria-plan health premiums have already been subtracted. The IRS calls it “total taxable wages, tips, and other compensation,” and it is the figure you carry to Line 1a of your Form 1040.1Internal Revenue Service. General Instructions for Forms W-2 and W-3 (2026)
What Counts as Wages in Box 1
Your employer starts with everything you earned during the year and then removes the items the tax code specifically excludes. What remains is Box 1. That includes:
- Salary, hourly wages, overtime, and shift differentials
- Commissions, bonuses (including signing bonuses), prizes, and awards
- All tips you reported to your employer
- Severance pay, treated the same as regular compensation
- Taxable fringe benefits, such as personal use of a company car
If your employer paid it and the code doesn’t specifically exempt it, it lands here.
What Lowers Box 1
The gap between your gross pay and Box 1 almost always comes from pre-tax deductions. These amounts come out of your paycheck before federal income tax is calculated, so they never enter Box 1 at all.
Traditional Retirement Plan Contributions
Traditional 401(k) contributions are the single biggest reduction for most employees. The money goes into the plan before income tax is withheld, and you won’t owe income tax on it until you withdraw the funds in retirement.2Internal Revenue Service. Topic No. 424, 401(k) Plans The same treatment applies to traditional 403(b), 457(b), and SIMPLE IRA deferrals. The deferred amount is reported separately in Box 12 with a code that identifies the plan type.
Cafeteria Plan Premiums and FSAs
Health, dental, and vision premiums withheld under a Section 125 cafeteria plan are excluded from Box 1. So are contributions to a health care flexible spending account or a dependent care FSA run through the same kind of plan.3Internal Revenue Service. Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans
HSA Contributions
Employer contributions to your Health Savings Account are excluded from Box 1, and so are your own HSA contributions if they’re made by payroll deduction under a cafeteria plan. The combined total shows up in Box 12 with code W.4Internal Revenue Service. HSA Contributions – IRS Courseware – Link and Learn Taxes
Dependent Care Benefits Up to $5,000
The first $5,000 of employer-provided dependent care assistance is excluded from Box 1. Anything above $5,000 gets added back and becomes taxable wages. The total benefit is shown in Box 10.5Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3
What Doesn’t Lower Box 1
Some payroll deductions look like they should reduce Box 1 but don’t. These are the most common causes of confusion when you compare your final pay stub to your W-2.
Roth 401(k) Contributions
Designated Roth contributions stay in Box 1. You’ve already paid income tax on that money — that’s the whole point of a Roth account. The contributions are reported separately in Box 12 (code AA for Roth 401(k), BB for Roth 403(b)), but they remain part of your taxable wages.6Internal Revenue Service. Retirement Plans FAQs on Designated Roth Accounts
Traditional IRA Payroll Deductions
Some employers will route part of your paycheck directly to a traditional IRA. That payroll deduction does not reduce Box 1. The IRS does not list traditional IRA contributions among the elective deferral codes that lower taxable wages.7Internal Revenue Service. Common Errors on Form W-2 Codes for Retirement Plans You claim the deduction yourself on your return if you qualify.
Most Moving Expense Reimbursements
Employer-paid moving expense reimbursements are taxable wages included in Box 1 for most employees. The moving expense exclusion was suspended for non-military taxpayers starting in 2018, and that suspension has been made permanent beginning in 2026. Active-duty military members moving under orders remain the only group who can still exclude qualified moving reimbursements.
Equity Compensation Can Inflate Box 1
Stock-based pay catches many employees by surprise. When you exercise a nonstatutory stock option, the spread between the exercise price and the fair market value on the exercise date is compensation, and your employer includes it in Box 1.8Internal Revenue Service. Topic No. 427, Stock Options When restricted stock units vest and shares are delivered, the fair market value on the vesting date is wages and also goes into Box 1.
A single vesting event or option exercise can push your Box 1 well above your base salary and into a higher tax bracket. If you have a large equity event coming, check whether your employer is withholding enough to cover the tax. The default supplemental withholding rate can leave you short at filing time.
Taxable Fringe Benefits in Box 1
Employer-provided group-term life insurance is tax-free up to $50,000 of coverage. The imputed cost of any coverage above that threshold is added to Box 1 (and also to Boxes 3 and 5).9Internal Revenue Service. Group-Term Life Insurance It’s often a small dollar amount, but it explains why Box 1 can be a few dollars higher than the number you calculated from your pay stub.
Other fringe benefits that end up in Box 1 include personal use of a company vehicle, employer-paid gym memberships, and non-deductible moving reimbursements. Adoption assistance from your employer can also add to Box 1 if it exceeds the annual exclusion limit.10Internal Revenue Service. Instructions for Form 8839
Why Box 1 Doesn’t Match Boxes 3 and 5
Your W-2 carries three wage figures: Box 1 for federal income tax, Box 3 for Social Security tax, and Box 5 for Medicare tax. Two factors drive most of the differences.
The Social Security Wage Cap
Social Security tax applies only up to an annual limit. For 2026, that cap is $184,500.11Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates If you earned more, Box 3 stops at $184,500 while Box 1 reflects your full taxable compensation. Medicare has no cap, so Box 5 includes everything.12Social Security Administration. What Is the Current Maximum Amount of Taxable Earnings for Social Security
Retirement Deferrals Reduce Box 1 Only
Cafeteria plan deductions reduce all three boxes equally. Traditional 401(k) contributions, however, only reduce Box 1. Retirement deferrals are still subject to Social Security and Medicare tax, so they stay in Boxes 3 and 5.2Internal Revenue Service. Topic No. 424, 401(k) Plans For an employee under the Social Security cap who contributes to a 401(k), Boxes 3 and 5 will typically be higher than Box 1. For a high earner above the cap, Box 1 may be the highest of the three.
Where Box 1 Goes on Your Return
Enter the Box 1 amount on Line 1a of Form 1040. If you have more than one W-2, add the Box 1 figures together and enter the combined total. That number is one piece of your total income, which flows into your adjusted gross income and, from there, determines eligibility for many credits and deductions with income phase-outs.
If Box 1 Looks Wrong
Reconcile the number yourself first. Start with your year-to-date gross pay from your final pay stub, subtract the pre-tax deductions covered above, and add any taxable fringes. The result should match Box 1. If it doesn’t, contact your employer’s payroll department. When there is a genuine error, your employer issues a Form W-2c showing the correction.13Internal Revenue Service. About Form W-2 C, Corrected Wage and Tax Statements
If your employer won’t cooperate, wait until the end of February and then call the IRS at 800-829-1040 to file a W-2 complaint. Have the employer’s name and full address ready.14Internal Revenue Service. W-2 – Additional, Incorrect, Lost, Non-Receipt, Omitted If the filing deadline is approaching and you still don’t have a corrected W-2, you can file using Form 4852 as a substitute, estimating your wages and withholding from your final pay stub.15Internal Revenue Service. About Form 4852, Substitute for Form W-2, Wage and Tax Statement, or Form 1099-R Using estimates can slow processing, and you may need to amend later if the final numbers differ.