What each box on your W2 means

Your W2 form has 14 numbered boxes plus some unnumbered ones. Each box reports a different piece of income or tax information your employer withheld. The boxes are arranged in two columns on the form, and not all of them will have numbers in them — that depends on what you earned and what your employer deducted.

The form itself is divided into two main sections: the top half shows your personal information and your employer's information, and the bottom half contains the numbered boxes where the actual dollar amounts and tax data live. Understanding what each box represents makes it much easier to use your W2 when you file your tax return or check your records.

Key Takeaways

  • Boxes 1 through 6 report your wages and the federal, state, and local taxes your employer withheld from your paychecks.
  • Box 12 shows additional compensation or deductions your employer made, marked with a letter code that tells you what kind of amount it is.
  • Boxes 13 through 20 contain information about retirement plans, dependent care, and other benefits you may have used during the year.
  • The top section of your W2 lists your name, address, and Social Security number, plus your employer's name, address, and EIN (Employer Identification Number).
  • You should receive your W2 by January 31 each year, and you need it to file your federal tax return.

The top section: your information and your employer's information

The very top of your W2 shows your name, address, and Social Security number exactly as your employer has them on file. Check that your Social Security number is correct — if it is wrong, contact your employer's payroll department and ask them to issue a corrected W2.

Below your information, you will see your employer's name, address, and their Employer Identification Number (EIN). The EIN is a nine-digit number that identifies your employer to the IRS, similar to how your Social Security number identifies you. You do not need to memorize or use this number yourself, but it is part of the official record that connects your W2 to your employer's tax filings.

Boxes 1 through 6: wages and tax withholding

Box 1 shows your total taxable wages for the year — this is the amount your employer used to calculate your federal income tax withholding. It includes your regular salary or hourly pay plus any bonuses, commissions, or other taxable compensation you received. It does not include pre-tax deductions like health insurance premiums or 401(k) contributions.

Box 2 shows the federal income tax your employer withheld from your paychecks throughout the year. This is the money that went to the IRS, not to you. When you file your tax return, you will compare this number to what you actually owe in federal taxes — if your employer withheld too much, you get a refund; if they withheld too little, you owe the difference.

Box 3 shows your total wages for Social Security purposes, and Box 4 shows the Social Security tax your employer withheld. Social Security tax is a fixed percentage of your wages up to a certain annual limit. Box 5 shows your total wages for Medicare purposes, and Box 6 shows the Medicare tax your employer withheld. Unlike Social Security tax, there is no annual limit on Medicare tax — it applies to all your wages.

Box 12: additional compensation and deductions marked with letter codes

Box 12 can contain multiple entries, each marked with a letter code (A through Z, then AA through DD). The letter tells you what kind of amount is being reported. For example, a code D means a 401(k) contribution, a code E means a 403(b) contribution, and a code DD means cost of employer-sponsored health insurance.

Common codes you might see include code A (uncollected Social Security tax on tips), code C (taxable coal mine health benefit payments), code W (employer-sponsored health insurance premiums), and code Y (deferrals under a section 409(a) nonqualified deferred compensation plan). If you see a code you do not recognize, the IRS publishes a full list of all codes on the instructions for Form W2.

The amounts in Box 12 affect your taxes in different ways depending on the code. Some reduce your taxable income, some are taxable but not subject to withholding, and some are informational only. Your tax software or tax preparer will know how to handle each code when you file.

Boxes 13 through 20: retirement plans, dependent care, and other benefits

Box 13 has three checkboxes: one for whether you participated in a retirement plan (like a 401(k), pension, or 403(b)) during the year, one for whether you are a statutory employee, and one for whether you received sick pay not included in Box 1. If the retirement plan box is checked, it tells the IRS that you have a workplace retirement plan, which affects whether you can deduct an IRA contribution on your tax return.

Box 14 is a catch-all box for other information your employer wants to report — it might include state income tax, local income tax, union dues, or other items specific to your employer or your state. The label next to Box 14 will tell you what the amount represents.

Boxes 15 through 20 report state and local tax information. Box 15 shows the state where you worked and your state wages, Box 16 shows state income tax withheld, Box 17 shows your local wages, Box 18 shows local income tax withheld, Box 19 shows your locality name, and Box 20 shows local income tax withheld. If you worked in more than one state or locality, you may have multiple W2 forms or multiple entries in these boxes.

Why the numbers on your W2 matter for your tax return

Your W2 is the official record of what you earned and what your employer withheld. When you file your federal tax return, you report the wages from Box 1 as your income. The IRS also receives a copy of your W2 directly from your employer, so they can verify that the income you reported matches what your employer reported.

The withholding amounts in Boxes 2, 4, and 6 are credits against your tax bill. If you earned less than expected or had major life changes during the year, your employer may have withheld too much, and you will receive a refund. If you earned more than expected or had too little withheld, you may owe taxes when you file.

The information in Box 13 about retirement plan participation affects whether you can deduct contributions to a traditional IRA. If you are covered by a workplace retirement plan and your income is above certain thresholds, your IRA deduction may be reduced or eliminated. The amounts in Box 12 with certain codes also reduce your taxable income, which lowers the amount of federal income tax you owe.

What to do if something on your W2 looks wrong

If you notice an error on your W2 — a wrong Social Security number, incorrect wages, or a box that should be empty but has a number — contact your employer's payroll or human resources department right away. Ask them to issue a corrected W2, which is called a W2-c (W2 corrected). Your employer must send you the corrected form and also send a corrected copy to the IRS.

Do not file your tax return with an incorrect W2. If you file before the correction arrives and then receive a corrected W2, you will need to file an amended tax return (Form 1040-X) to match the corrected information. It is much simpler to wait for the correction or contact your employer when ready if you spot the error before you file.

If your employer does not issue a corrected W2 within a reasonable time, you can file a complaint with the IRS using Form 13909 (Information Referral). Keep copies of all correspondence with your employer about the error.

Frequently Asked Questions

When should I receive my W2?

Your employer must send you a W2 by January 31 of the year following the year you worked. If you do not receive it by early February, contact your employer's payroll department. You can also contact the IRS at 800-829-1040 if your employer does not send it by the end of February.

What if I worked for multiple employers during the year?

You will receive a separate W2 from each employer. When you file your tax return, you report the wages from all your W2 forms combined. Each W2 is filed separately with the IRS, so they will have a complete record of all your income.

Do I need my W2 to file my taxes?

Yes, you need your W2 to file your federal tax return. Your tax software will ask you to enter the information from Box 1 (wages) and Box 2 (federal withholding) at minimum. You may also need information from other boxes depending on your situation.

What does it mean if Box 13 is checked for retirement plan participation?

It means you were covered by a workplace retirement plan (401(k), 403(b), pension, or similar) during the year. This affects your ability to deduct a traditional IRA contribution on your tax return if your income is above certain limits. The IRS publishes the income limits each year.

Can I file my taxes before I receive my W2?

You can file early if you have all the information you need, but most people wait for their W2 to arrive to make sure they have the correct wage and withholding amounts. Filing with incorrect information can delay your refund or create problems with the IRS later.