Your W-2 doesn’t match your salary because Box 1 reports federal taxable wages, not the gross pay your employer promised you. Pre-tax deductions such as traditional 401(k) contributions and health insurance premiums pull the number below your salary, while taxable benefits like excess group-term life insurance or a year-end bonus can push it above. In almost every case, the gap is the sum of those adjustments, not a payroll error.
What Box 1 Actually Reports
Box 1 is labeled “Wages, tips, other compensation.” Federal law defines wages broadly for withholding purposes, then carves out dozens of exclusions for pre-tax retirement deferrals and qualified benefit plans.1Office of the Law Revision Counsel. 26 USC 3401 Definitions The Box 1 total starts with your gross pay, subtracts the pre-tax benefits you elected, and adds any taxable fringe benefits you received. What lands in the box is your federal taxable wages, which is almost never equal to your salary.
Pre-Tax Deductions That Lower Box 1
The most common reason your W-2 looks smaller than your salary is pre-tax withholding. Every dollar routed into a qualifying benefit plan before tax comes out of gross pay before Box 1 is calculated.
Traditional Retirement Contributions
Traditional pre-tax contributions to a 401(k), 403(b), or governmental 457(b) plan are excluded from Box 1. Earn $80,000, defer $10,000 into a traditional 401(k), and Box 1 shows roughly $70,000 before any other adjustments.2Internal Revenue Service. Topic No. 424, 401(k) Plans For 2026, the standard elective deferral limit is $24,500. Employees age 50 or older can add $8,000 in catch-up contributions, and participants ages 60 through 63 can use a higher catch-up of $11,250 in place of the $8,000.3Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 Every dollar you contribute up to these limits reduces Box 1 dollar for dollar.
Health Coverage, HSAs, and FSAs
Premiums for employer-sponsored health, dental, and vision coverage paid through a Section 125 cafeteria plan come out before federal tax applies. So do contributions to a Health Savings Account, where the 2026 limits are $4,400 for self-only coverage and $8,750 for family coverage.4IRS.gov. Notice 2026-5 Expanded Availability of Health Savings Accounts Health care flexible spending accounts allow up to $3,400 in pre-tax contributions for 2026. Dependent care FSAs now allow up to $7,500 per household, or $3,750 if married filing separately, up from the earlier $5,000 cap.5IRS.gov. Publication 15-B Employers Tax Guide to Fringe Benefits 2026 The more you contribute across these buckets, the wider the gap between your salary and your Box 1 figure.
Why Roth Contributions Don’t Lower Box 1
Money you send to a designated Roth 401(k) or Roth 403(b) stays in Box 1. Roth contributions are made with after-tax dollars in exchange for tax-free withdrawals in retirement, so they don’t reduce current taxable wages. Your W-2 lists the Roth amount separately in Box 12 using Code AA for a Roth 401(k), Code BB for a Roth 403(b), or Code EE for a Roth governmental 457(b).6Internal Revenue Service. Common Errors on Form W-2 Codes for Retirement Plans If you recently switched from traditional to Roth deferrals, Box 1 will look noticeably higher than the prior year even though your salary and total contributions haven’t changed.
Taxable Benefits That Push Box 1 Above Your Salary
Some employer-provided benefits add to Box 1 even when no extra cash lands in your bank account. These additions are why the W-2 sometimes exceeds base salary.
Group-Term Life Insurance Over $50,000
When an employer provides group-term life insurance above $50,000, the cost of the excess coverage counts as taxable income.7eCFR. 26 CFR 1.79-1 Group-Term Life Insurance General Rules The IRS uses a uniform premium table based on your age rather than what the employer actually pays the insurer. The monthly cost per $1,000 of excess coverage ranges from $0.05 for employees under 25 to $2.06 for those 70 and older.5IRS.gov. Publication 15-B Employers Tax Guide to Fringe Benefits 2026 A 55-year-old employee with $150,000 of coverage has imputed income calculated on the $100,000 excess at $0.43 per $1,000 per month, or about $516 for the year. Small, but enough to push Box 1 above salary.
Bonuses, Commissions, and Other Taxable Pay
Performance bonuses, sales commissions, severance, and taxable awards are fully included in Box 1 alongside regular wages. A $5,000 year-end bonus on a $65,000 salary means Box 1 starts at $70,000 before any deductions. Employer-paid moving expense reimbursements are also taxable for most workers; only active-duty military and intelligence community personnel qualify for an exclusion.8IRS.gov. General Instructions for Forms W-2 and W-3 2026 Employer-provided educational assistance is tax-free up to $5,250 per year, but anything above that threshold is added to taxable wages.9Office of the Law Revision Counsel. 26 US Code 127 – Educational Assistance Programs
Why Boxes 3 and 5 Don’t Match Box 1
Boxes 3 (Social Security wages) and 5 (Medicare wages) frequently show different numbers than Box 1, which adds another layer of confusion.
The key rule: traditional 401(k) and 403(b) contributions reduce Box 1 but not Boxes 3 or 5. Social Security and Medicare taxes apply to gross wages before retirement deferrals come out. So on an $80,000 salary with a $10,000 traditional 401(k) contribution, Box 1 shows about $70,000 while Boxes 3 and 5 sit closer to $80,000, reduced only by cafeteria-plan deductions such as health premiums. The boxes use different rules, not the same starting point.
Box 3 also has a ceiling. Social Security tax applies only to earnings up to $184,500 in 2026.10Social Security Administration. Contribution and Benefit Base Earnings above that cap Box 3 at $184,500, while Box 5 keeps rising with no limit. Employers must also start withholding an additional 0.9% Medicare tax once your wages exceed $200,000 in a calendar year.11Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
Reading Box 12 to Trace the Difference
Box 12 itemizes the deductions, contributions, and benefits that shaped your Box 1 figure. The codes you’re most likely to see:
- Code D: Traditional 401(k) elective deferrals, which reduce Box 1
- Code E: Traditional 403(b) salary reduction contributions, which reduce Box 1
- Code G: 457(b) deferred compensation, which reduces Box 1
- Code W: HSA contributions, including employer amounts and cafeteria-plan elections, which reduce Box 1
- Code AA: Designated Roth 401(k) contributions, which do not reduce Box 1
- Code BB: Designated Roth 403(b) contributions, which do not reduce Box 1
- Code DD: Cost of employer-sponsored health coverage, informational only and not taxable
Add the Code D or Code E amount back to Box 1 and the result should sit much closer to your gross salary. That single calculation is usually enough to confirm that the shortfall is pre-tax retirement money, not a mistake.6Internal Revenue Service. Common Errors on Form W-2 Codes for Retirement Plans
Reconciling With Your Final Pay Stub
Your last pay stub of the year carries year-to-date totals that let you verify every W-2 number. Start with gross earnings YTD. Subtract each pre-tax deduction YTD: health and dental premiums, HSA contributions, FSA contributions, and traditional retirement deferrals. Add back any taxable imputed income, such as excess group-term life insurance. The result should match Box 1.
If the numbers still don’t line up, look for a mid-year change: a switch of health plans at open enrollment, a pause in retirement contributions, a late bonus. Confirm that one-time items like bonuses and stock compensation show up in both the pay stub YTD and the W-2. Rounding differences of a few dollars are normal.
Pay Date Timing Can Shift Wages Between Years
The calendar itself can create real discrepancies. Income is taxable in the year it becomes available to you, not the year you performed the work.12eCFR. 26 CFR 1.451-2 Constructive Receipt of Income Work the last week of December and get paid in January, and those wages land on the following year’s W-2. Depending on how a biweekly schedule falls, one year can hold 27 paychecks and the next only 25, which alone can move your W-2 by thousands of dollars.
Direct deposit follows the same rule. If your employer schedules a December 31 pay date but the funds don’t post until January 2, the IRS generally treats the income as received when it was credited to your account.
What to Do if the W-2 Still Looks Wrong
After accounting for pre-tax deductions, taxable benefits, and timing, a stubborn mismatch could mean a real error. Common ones include the wrong Social Security number, a duplicated bonus, or a deduction posted under the wrong Box 12 code. Start with your employer’s payroll or HR department and ask them to review the figures.
Getting a Corrected W-2
If payroll confirms a mistake, your employer must issue Form W-2c (Corrected Wage and Tax Statement) and file Form W-3c with the Social Security Administration.13Social Security Administration. Helpful Hints to Forms W-2c/W-3c Filing You receive a corrected copy as well. There is no filing fee and no fixed deadline, but the correction should go through as soon as possible to keep it from tangling your return.14Internal Revenue Service. About Form W-2 C, Corrected Wage and Tax Statements
If Your Employer Doesn’t Fix It
Employers must furnish W-2s by early February of the following year. For 2026 wages, the deadline is February 1, 2027.15Internal Revenue Service. General Instructions for Forms W-2 and W-3 2026 If you haven’t received your W-2, or your employer won’t correct an error, by the end of February, call the IRS at 800-829-1040 or visit an IRS Taxpayer Assistance Center. The IRS will contact the employer and request a corrected form within 10 days.16Internal Revenue Service. If You Dont Get a W-2 or Your W-2 Is Wrong
If a corrected W-2 doesn’t arrive in time to file, use Form 4852 (Substitute for Form W-2) to estimate your wages from your pay stubs and attach it to your return. If the eventual W-2c differs from your estimates, file an amended return on Form 1040-X.16Internal Revenue Service. If You Dont Get a W-2 or Your W-2 Is Wrong