Your W-2 form reports your annual wages and the taxes your employer withheld from your paychecks. It arrives each January, and you need it to file your federal and state tax returns. Most of the boxes look confusing the first time, but each one has a specific purpose — and understanding them helps you file correctly and catch errors before they become problems.
Who Gets a W-2 and When
If you worked as an employee at any point during the year — full-time, part-time, or seasonal — your employer is required to send you a W-2 by January 31. If you had multiple jobs, you will receive a separate W-2 from each employer. Employers also file copies with the IRS and your state tax agency, which is why your reported income must match what you claim on your return.
Freelancers and independent contractors receive a 1099 form instead of a W-2. If you did both employed and contract work in the same year, you will receive both types of forms.
The Key Boxes on Your W-2
Boxes 1–2: Federal Income
Box 1 shows your total taxable wages, tips, and other compensation for the year. This is the number that goes on your federal tax return as wages. It is not the same as your gross pay — it excludes pre-tax deductions like your 401(k) contributions and health insurance premiums. Box 2 shows the total federal income tax your employer withheld from your paychecks.
Boxes 3–6: Social Security and Medicare
Box 3 is your wages subject to Social Security tax, and Box 4 is the Social Security tax withheld (6.2% of Box 3, up to the annual wage base). Box 5 is wages subject to Medicare tax — this can be higher than Box 3 because there is no cap — and Box 6 is Medicare tax withheld (1.45%, plus an extra 0.9% on earnings above $200,000).
Box 12: Benefit Codes
Box 12 reports various types of compensation and benefits using letter codes. Common ones: Code D — traditional 401(k) contributions; Code DD — cost of employer-sponsored health coverage (informational, not taxable); Code W — employer contributions to your Health Savings Account; Code AA — Roth 401(k) contributions. Your tax software handles these automatically when you enter them.
Box 13: Checkboxes
Three checkboxes appear in Box 13. Statutory employee means your employer treated you as an employee for Social Security purposes but not income tax — relevant for certain commission-based workers. Retirement plan indicates you were eligible for an employer retirement plan, which affects whether you can deduct a traditional IRA contribution. Third-party sick pay applies if you received disability payments from an insurer.
Boxes 15–17: State Taxes
Box 15 identifies your state and employer’s state tax ID. Box 16 is your state taxable wages (which may differ from Box 1 depending on your state’s tax rules). Box 17 is the state income tax withheld. These boxes feed directly into your state return. If you worked in multiple states, you may see multiple rows here.
Boxes 7–10: Tips and Dependent Care
Boxes 7 and 8 report Social Security tips and allocated tips — relevant for restaurant and service workers. Box 10 shows dependent care benefits provided through your employer’s flexible spending account. Up to $5,000 of employer-provided dependent care is excluded from income. If Box 10 has an amount, Form 2441 is required with your return.
Why Box 1 Is Lower Than Your Total Pay
Box 1 is often significantly lower than your gross salary, and that is normal. Pre-tax deductions reduce your taxable wages before Box 1 is calculated. Common pre-tax deductions include: traditional 401(k) and 403(b) contributions, health insurance premiums paid through your employer, dental and vision insurance, Flexible Spending Account (FSA) contributions, and Health Savings Account (HSA) contributions made through payroll.
These deductions lower your Box 1 wages — meaning you pay less federal income tax on them. That is by design. But they do not reduce your Social Security and Medicare wages in Box 3 and Box 5 (with the exception of HSA contributions), which is why those boxes may be higher than Box 1.
What to Check Before Filing
Before entering your W-2 into your tax return, verify a few things. Confirm your Social Security number in Box a is correct — an incorrect SSN means the IRS cannot match your return to your wages on file. Check that your employer’s EIN in Box b matches any prior year W-2s from the same employer. Review Box 1 against your final pay stub of the year to make sure the amounts are consistent with your expected earnings minus pre-tax deductions.
If you find an error on your W-2, contact your employer’s payroll department. They can issue a corrected W-2 (Form W-2c). If your employer will not correct it or you cannot reach them, file your return using the correct information and attach Form 4852, which is a substitute W-2.
What If You Did Not Receive Your W-2
Employers must mail or electronically deliver W-2s by January 31. If you have not received yours by mid-February, contact your employer’s payroll or HR department. If you cannot get it resolved, call the IRS at 800-829-1040 — they can contact your employer on your behalf and provide a wage transcript you can use to file. You should not delay filing significantly while waiting, as the tax deadline still applies.
W-2 box rules and thresholds can change annually. Verify current figures with the IRS instructions for Form W-2 or a qualified tax preparer before filing.