What Is a W-2 Form? A Complete Guide for Employees

Every January, employees receive a W-2 form from their employer. It's one of the most important tax documents you'll handle — but many people file it without fully understanding what it says. This guide explains every key section of the W-2 and how to use it to file your return accurately.

What Is a W-2 Form?

A W-2 (officially the Wage and Tax Statement) is a federal tax form your employer is required to send you by January 31 each year. It reports how much you earned from that employer during the previous tax year, and how much was withheld for federal income tax, Social Security, and Medicare.

If you worked for multiple employers in the same year, you'll receive a separate W-2 from each one. You'll need all of them to file your tax return.

Who Gets a W-2?

You receive a W-2 if you're an employee — meaning taxes are withheld from your paycheck. If you're a freelancer, contractor, or self-employed, you receive a 1099-NEC instead, which reports income but has no tax withheld.

Key Boxes on the W-2 Explained

• Box 1 — Wages, tips, other compensation: Your total taxable wages for the year. This is what you report on your tax return.
• Box 2 — Federal income tax withheld: Total federal tax your employer withheld from paychecks. If this is higher than what you owe, you get a refund.
• Box 3 — Social Security wages: Wages subject to Social Security tax (capped at $168,600 for 2024).
• Box 4 — Social Security tax withheld: 6.2% of Box 3 wages.
• Box 5 — Medicare wages: Wages subject to Medicare tax (no cap).
• Box 6 — Medicare tax withheld: 1.45% of Box 5 wages (2.35% if you earn over $200,000).
• Box 12 — Various codes: Retirement contributions (code D for 401k), HSA contributions, and more.
• Box 13 — Retirement plan checkbox: Checked if you participated in an employer retirement plan — affects IRA deductibility.
• Boxes 15–17 — State information: State employer ID, state wages, and state income tax withheld.

W-2 Box 1 vs Your Last Pay Stub

Box 1 is often lower than your total pay stubs because pre-tax deductions reduce taxable wages. These include 401(k) contributions, health insurance premiums (if employer-sponsored), FSA or HSA contributions, and transit/commuter benefits. This is intentional — these deductions are tax-advantaged.

What to Do With Your W-2

1. 1Check that your name, address, and Social Security Number are correct.
2. 2Enter the information into your tax return (Box 1 goes on Line 1a of Form 1040).
3. 3Make sure federal and state withholding match your records.
4. 4Keep the W-2 for at least 3 years after filing in case of an audit.
5. 5If you never received it by February 15, contact your employer's payroll department.

Common W-2 Mistakes

• Wrong SSN or name: Contact your employer immediately for a corrected W-2C form.
• Missing employer address: This doesn't affect filing — only boxes 1–17 matter.
• Multiple W-2s: Add Box 1 amounts from all W-2s together on your return.
• Forgetting state taxes: Many states require you to file separately using Box 15–17.
• Electronic vs. paper: If you opted into electronic delivery, check your employer's HR portal.