What Is a W-2? Boxes, Codes & How to Read It

1. What Is a W-2?

Form W-2, officially called the “Wage and Tax Statement,” is the document your employer is required to prepare for you at the end of each calendar year. It reports two main things: how much you were paid and how much tax was withheld from your paychecks.

The W-2 is issued by your employer, not by you. You receive a copy, the Social Security Administration (SSA) receives a copy, and the IRS receives a copy. This is how the government knows what you earned before you even file your return — and it’s why the numbers on your tax return need to match your W-2.

If you are a W-2 employee (meaning your employer withholds taxes from your paycheck), this form is the foundation of your federal income tax return. The wages reported in Box 1 of your W-2 flow directly onto Line 1 of Form 1040.

2. Who Gets a W-2?

You should receive a W-2 if you are an employee — meaning your employer controls what work you do and how you do it, withholds income taxes and FICA taxes from your pay, and reports your wages to the SSA.

You will not receive a W-2 if you are an independent contractor (you’d receive a 1099-NEC instead), self-employed, or receiving income solely from investments, pensions, or government benefits.

If you worked for more than one employer during the year, you will receive a separate W-2 from each one. All of them must be reported on your tax return.

Your employer is required to send (or make available) your W-2 by January 31 of the following year. If you haven’t received it by mid-February, contact your employer first. If that doesn’t resolve it, you can contact the IRS at 1-800-829-1040 for assistance.

3. W-2 Boxes Explained: A Complete Guide

A W-2 has many boxes, and each one serves a specific purpose. The table below explains the most important ones:

Source: IRS General Instructions for Forms W-2 and W-3 (2026). Social Security wage base of $184,500 per SSA for the current tax year.

4. Box 12 Codes: What the Letters Mean

Box 12 is where employers report specific benefits, contributions, and compensation using letter codes. You may see one or more entries in slots 12a through 12d. These are the codes employees encounter most often:

5. Why Box 1 Is Different From Your Total Salary

One of the most common questions about the W-2 is: “Why is Box 1 lower than my actual salary?” The answer is pre-tax deductions.

Box 1 reports your taxable wages — your gross pay minus certain pre-tax deductions that reduce your federal taxable income. These deductions include:

• Traditional 401(k) or 403(b) contributions (Box 12, Code D or E)
• Health Savings Account (HSA) contributions (Box 12, Code W)
• Employer-sponsored health insurance premiums (your share, paid pre-tax)
• Flexible Spending Account (FSA) contributions
• Commuter/transit benefits

For example, if your annual salary is $75,000 and you contribute $6,000 to a 401(k) and $2,000 to an HSA, your Box 1 would show approximately $67,000 — not $75,000.

Meanwhile, Box 3 (Social Security Wages) and Box 5 (Medicare Wages) may be higher than Box 1 because most pre-tax retirement contributions are still subject to FICA taxes, even though they reduce your federal taxable income.

6. What Changed on the 2026 W-2 (OBBBA Updates)

The One Big Beautiful Bill Act (OBBBA), signed into law in July 2025, introduced several changes that affect the 2026 Form W-2. These are the key updates:

Three new Box 12 codes were added: TA (Trump account contributions), TP (qualified tips), and TT (qualified overtime compensation). These support the new above-the-line deductions that employees can claim on their individual returns. Important: the tips deduction (TP) and overtime deduction (TT) are temporary — they apply only to tax years 2025 through 2028. These deductions are not permanent and will expire unless Congress extends them.

Box 14 was split into two parts. Box 14a retains the “Other” label for miscellaneous items (state disability taxes, union dues, etc.). The new Box 14b is specifically for the Treasury Tipped Occupation Code — a code that identifies whether an employee’s job qualifies for the tips deduction. If your employer reports code “000” in Box 14b, your tips are not treated as qualified tips for deduction purposes.

Wage reporting threshold increased. For wages paid after calendar year 2025, employers are only required to file a W-2 if total compensation is $2,000 or more (up from $600), provided no federal income, Social Security, or Medicare tax was withheld. This change primarily affects very low-wage or short-term employment situations.

7. How to Use Your W-2 When Filing Your Tax Return

When you sit down to file your federal tax return (Form 1040), the W-2 provides the numbers you need:

Box 1 → Form 1040, Line 1. This is your starting income figure — your wages, salaries, and tips as reported by your employer.

Box 2 → Applied as a credit. The federal income tax your employer already withheld throughout the year is applied against your total tax liability. If Box 2 exceeds what you owe, you get a refund. If it’s less, you owe the difference.

Box 12 codes → Various schedules. If you see Code D (401(k) contributions), that amount already reduced your Box 1 wages — you don’t deduct it again. But Code W (HSA) may need to be reported on Form 8889. Code DD (health coverage cost) is informational only and does not affect your tax calculation.

Boxes 15–20 → State and local returns. Use these boxes when filing your state income tax return. In states like New York, the state wages in Box 16 may differ from the federal wages in Box 1 because some deductions are treated differently at the state level.

8. What to Do If Your W-2 Is Wrong or Missing

If your W-2 contains an error: Contact your employer’s payroll or HR department first. Common errors include incorrect Social Security numbers, wrong wage amounts, or missing Box 12 codes. Your employer can issue a corrected Form W-2c.

If you haven’t received your W-2 by mid-February: First, verify your mailing address with your employer and check if an electronic version is available through your company’s payroll portal. If you still can’t get it, call the IRS at 1-800-829-1040 — they can contact your employer on your behalf.

If you need to file before your W-2 arrives: You can use Form 4852, Substitute for Form W-2, Wage and Tax Statement. Use your final pay stub to estimate the amounts. However, if the actual W-2 arrives later with different numbers, you may need to file an amended return (Form 1040-X).