Box 1 of your W-2 is neither your gross pay nor your take-home pay. It’s your federally taxable wages: gross pay minus the pre-tax deductions the tax code lets your employer exclude, plus certain taxable benefits the tax code requires them to add. So when you’re asking whether W-2 Box 1 is gross or net, the honest answer is that it sits between the two, and the gap comes from a specific list of items rather than from withholding.
Withholding never touches Box 1. Federal income tax withheld, Social Security tax, Medicare tax, and state tax all come out of your paycheck after Box 1 is calculated, and they’re reported in other boxes. That’s why Box 1 isn’t your net pay even though it’s smaller than your gross.
What Comes Out of Gross Pay to Get to Box 1
Your employer starts with everything you earned during the year and removes items excluded from federal income tax. What remains is Box 1, which the IRS describes as “total taxable wages, tips, and other compensation.”1Internal Revenue Service. General Instructions for Forms W-2 and W-3 (2026)
The biggest reduction for most employees is a traditional 401(k) contribution. That money goes into your account before income tax is calculated, so it reduces Box 1 dollar-for-dollar, and you’ll owe income tax on it when you withdraw the funds in retirement.2Internal Revenue Service. Topic No. 424, 401(k) Plans The same treatment applies to traditional contributions to 403(b) plans, 457(b) plans, and SIMPLE IRAs. Your employer reports these deferrals in Box 12 using a code specific to each plan type.
Pre-tax health coverage takes another slice. Health, dental, and vision premiums withheld under a Section 125 cafeteria plan are excluded from Box 1, and so are contributions to a health care flexible spending account or dependent care FSA run through that plan.3Internal Revenue Service. Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans
Health Savings Account contributions work the same way. Employer HSA contributions are excluded from Box 1, and if you fund your HSA through payroll deduction under a cafeteria plan, your contributions are excluded too. The combined total appears in Box 12 with code W.4Internal Revenue Service. HSA Contributions – IRS Courseware – Link and Learn Taxes
Dependent care benefits get partial treatment. The first $5,000 in employer-provided dependent care assistance is excluded from Box 1. Anything above $5,000 gets added back and is taxable. The full amount, including any excess, shows up in Box 10.5Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3
Deductions That Look Pre-Tax but Aren’t
Some paycheck items feel like they should shrink Box 1 and don’t. This is where employees most often miscalculate.
Designated Roth 401(k) contributions stay in Box 1. You pay income tax on that money now, which is the entire point of a Roth. Your employer reports the contributions in Box 12 with code AA (Roth 401(k)) or BB (Roth 403(b)), but the amount remains part of your taxable wages.6Internal Revenue Service. Retirement Plans FAQs on Designated Roth Accounts
Traditional IRA contributions run through payroll also don’t reduce Box 1. The IRS does not list traditional IRA contributions among the Box 12 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. The full contribution still sits in Box 1.
Employer-paid moving reimbursements are taxable wages for most employees and appear in Box 1. The moving expense deduction was suspended for non-military taxpayers starting in 2018, and that suspension was made permanent beginning in 2026. Active-duty military members moving under orders are the only group who can still exclude qualified moving reimbursements from income.
What Gets Added on Top of Your Pay
Box 1 isn’t only subtraction. Certain benefits get added even though no cash changed hands in that pay period.
Group-term life insurance is the most common. Your employer can provide up to $50,000 of coverage tax-free. The imputed cost of any coverage above $50,000 is taxable and gets included in Box 1 (and in Boxes 3 and 5).8Internal Revenue Service. Group-Term Life Insurance The amount is usually small, and it explains the extra dollars many employees notice when Box 1 is slightly higher than expected after subtracting pre-tax deductions.
Other taxable fringe benefits that land in Box 1 include personal use of a company vehicle, employer-paid gym memberships, and adoption assistance that exceeds the annual exclusion limit.9Internal Revenue Service. Instructions for Form 8839
Equity compensation can add large amounts. 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 goes into Box 1.10Internal Revenue Service. Topic No. 427, Stock Options When restricted stock units vest, the fair market value of the delivered shares on the vesting date counts as wages and lands in Box 1. A single vesting event can inflate the box well beyond your cash salary for the year.
Reconciling Your Gross Pay to Box 1
To check your W-2, start with year-to-date gross pay from your final pay stub. Subtract:
- Traditional 401(k), 403(b), 457(b), or SIMPLE IRA contributions
- Pre-tax health, dental, and vision premiums
- Health and dependent care FSA contributions (up to $5,000 for dependent care)
- Pre-tax HSA contributions
Then add:
- Imputed income for group-term life coverage above $50,000
- The taxable value of personal use of a company car and similar fringe benefits
- Any stock option spread or RSU vesting value for the year
- Dependent care benefits above $5,000
- Non-military moving expense reimbursements
The result should equal Box 1. If it doesn’t, contact your employer’s payroll department. If they agree there’s an error, they’ll issue a Form W-2c showing the correction.11Internal Revenue Service. About Form W-2 C, Corrected Wage and Tax Statements If they won’t help, wait until the end of February and file a W-2 complaint with the IRS at 800-829-1040 or at a taxpayer assistance center.12Internal Revenue Service. W-2 – Additional, Incorrect, Lost, Non-Receipt, Omitted If the filing deadline is closing in without a corrected W-2, Form 4852 lets you file using estimated wages and withholding based on your final pay stub.13Internal Revenue Service. About Form 4852, Substitute for Form W-2, Wage and Tax Statement, or Form 1099-R
Why Box 1 Doesn’t Match Boxes 3 and 5
Once you understand Box 1, the next puzzle is usually why the Social Security wages in Box 3 and the Medicare wages in Box 5 show different numbers. Two rules explain almost every difference.
First, Social Security tax applies only up to an annual wage cap. For 2026, the cap is $184,500.14Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates Earn more than that, and Box 3 stops at the cap while Box 1 keeps going. Box 5 has no cap.15Social Security Administration. What Is the Current Maximum Amount of Taxable Earnings for Social Security
Second, not every pre-tax deduction reduces every box. Section 125 cafeteria plan deductions cut Box 1, Box 3, and Box 5 by the same amount. Traditional 401(k) contributions cut only Box 1; they remain 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 below the Social Security wage cap who contributes to a traditional 401(k), Boxes 3 and 5 will be higher than Box 1. For a high earner above the cap, Box 1 may be the largest of the three.