What Is a W-2 Form Explained — A Plain English Guide

What's a W-2? In one sentence: it's the U.S. tax form your employer sends you each January, showing the previous year's wages and the federal, state, and FICA taxes withheld from them. You attach it to your tax return so the IRS can compare what was withheld against what you actually owe for the year.

January 31 is the federal deadline. Every U.S. employer has to put a W-2 in the mail (or in an inbox as a PDF) by that date for every person who worked for them the previous year. The form summarises a year of wages and tax withholding in a single document, and it's the foundation of most personal income tax filings.

For something that arrives once a year and gets glanced at briefly before being passed to a tax preparer or tax software, the W-2 carries a lot of weight.

What is a W-2 form?

The W-2, formally called the Wage and Tax Statement, is a U.S. tax document issued by employers to each employee at the end of every calendar year. According to the Internal Revenue Service, it reports "an employee's annual wages and the amount of taxes withheld from his or her paycheck."

Two copies of every W-2 exist. One goes to the employee. Another goes to the IRS (and to the relevant state tax agency for state income tax). Because the IRS already has a copy when the employee files their tax return, the numbers must match. Employers are required to issue W-2s by January 31 each year, covering the calendar year that just ended.

Anyone classified as an employee — full-time, part-time, salaried, or hourly — receives a W-2. People classified as independent contractors receive a different form, which we cover in our piece on what is a 1099 form.

What each box on a W-2 means

The W-2 looks intimidating because it has many boxes. The structure is logical once broken down. The boxes group into four categories.

Identifying information (boxes a–f)

These boxes identify the employee, the employer, and the tax year:

• Box a — Employee's Social Security number
• Box b — Employer's identification number (EIN)
• Box c — Employer's name and address
• Box d — Control number (used internally by employers; sometimes blank)
• Box e — Employee's name
• Box f — Employee's address

If your name, address, or Social Security number is wrong, that's the most important error to catch — it can cause the IRS to mismatch your filing.

Federal wages and tax (boxes 1–6)

This is the most important section for federal tax filing.

Box 1 reports wages, tips, and other compensation — the total taxable wages for federal income tax purposes. This number is lower than gross pay if pre-tax deductions like a traditional 401k contribution were taken, since those reduce taxable wages.

Box 2 reports federal income tax withheld — the total federal tax withheld from your paychecks during the year. It's the running total from your pay stubs.

Box 3 reports Social Security wages — the wages subject to Social Security tax, capped at the annual Social Security wage base ($176,100 for 2025). Pre-tax 401k contributions don't reduce this; some other benefits do.

Box 4 is the Social Security tax withheld — 6.2% of Box 3, which maxes out at $10,918.20 once Box 3 hits the 2025 wage-base ceiling.

Box 5 reports Medicare wages and tips — all wages subject to Medicare tax, with no annual cap. Pre-tax 401k contributions don't reduce this either.

Box 6 is the Medicare tax withheld — 1.45% of Box 5, plus the Additional Medicare Tax of 0.9% on wages above $200,000 single / $250,000 married filing jointly. For a deeper look at how the Social Security + Medicare halves of payroll tax fit together, see our piece on FICA tax explained.

The relationship between Boxes 1, 3, and 5 catches many people the first time they look. If you contributed to a traditional 401k during the year, Box 1 will be smaller than Boxes 3 and 5 by the contribution amount. That's correct and intentional — the 401k is pre-tax for income tax but not for FICA.

Other compensation and deductions (boxes 7–14)

Most of these boxes are blank for most employees but become relevant in specific situations.

Box 7 is Social Security tips — tips reported to the employer.

Box 8 is allocated tips — tips assigned by the employer (mainly for tipped service workers).

Box 9 is reserved by the IRS — now blank for nearly all filers.

Box 10 is dependent care benefits.

Box 11 covers nonqualified plans.

Box 12 is a miscellaneous catch-all, with letter codes (D, DD, E, etc.) indicating what each entry represents. Code D is traditional 401k contributions; Code DD is the cost of employer-provided health insurance; many other codes exist.

Box 13 has three checkboxes: statutory employee, retirement plan participant, third-party sick pay.

Box 14 is "Other" — used by some employers for state-specific items or informational entries.

State and local tax (boxes 15–20)

These boxes report state and local tax information:

• Box 15 — State name and the employer's state tax ID
• Box 16 — State wages, tips, etc.
• Box 17 — State income tax withheld
• Box 18 — Local wages, tips, etc.
• Box 19 — Local income tax withheld
• Box 20 — Locality name

If you lived in a state with no income tax (one of the nine states without state income tax), Boxes 15–17 may be blank.

How a W-2 is used at tax time

The W-2 is the foundation of an annual U.S. tax return for most employees. The numbers on it flow directly into specific lines on the federal Form 1040 and on state tax returns.

When you file your tax return — whether on paper, through tax software, or through a tax preparer — the process is essentially:

1. Enter the figures from your W-2 (and any 1099s, if you also have non-employee income)
2. Apply standard or itemised deductions to calculate taxable income (the TY 2025 standard deduction is $15,750 single / $31,500 married filing jointly)
3. Apply the marginal tax brackets to calculate total tax owed for the year
4. Compare total tax owed to what was withheld (Box 2 + Box 17)
5. The difference is either a refund (withholding was higher than owed) or a balance due (withholding was lower than owed)

A refund isn't a windfall — it's a return of money you over-paid throughout the year. A balance due isn't a penalty — it's a top-up because withholding was lower than the year's actual tax bill. The W-2 is what makes this reconciliation possible.

For broader context on what the federal tax dollars in Box 2 actually fund, see our piece on what taxes are used for.

Common misconceptions

Three patterns trip people up regularly when they read their W-2 for the first time.

The first is the assumption that the wages on a W-2 should match the year-to-date number on any pay stub. They should match the year-to-date numbers from your last paycheck of the year, but not necessarily a mid-year pay stub. And the wage figure that matches is usually the YTD gross minus any pre-tax deductions (Box 1), not the YTD gross itself.

The second is the idea that you only need to file taxes if you owe. Most U.S. employees are required to file regardless of whether they owe additional tax. Filing reconciles the year and triggers any refund owed. The IRS keeps refunds unclaimed after a certain number of years.

The third is the belief that a W-2 covers everything you earned. It covers everything you earned as an employee from that employer. Income from other jobs, freelance work, investments, or side businesses is reported separately — usually on 1099 forms, which we cover in our piece on what is a 1099 form.

What research and experts say

The Internal Revenue Service publishes the official W-2 form, instructions, and an explanation of what each box represents.

Investopedia's W-2 explainer covers the same material with examples and additional context on how the form interacts with the broader U.S. tax system.

For the running mid-year version of the same numbers, see our walkthrough on how to read a pay stub — every line on a W-2 corresponds to a year-to-date total accumulating on the pay stubs throughout the year. For the broader U.S. tax picture the W-2 fits into — standard vs itemised deductions, marginal vs effective rates, FICA — our tax concepts pillar guide connects every concept in one place.

Frequently asked questions

What is a W-2 form? A W-2 is a U.S. tax form that an employer issues to each employee every January, summarising the previous year's wages and the taxes withheld from those wages. Employees use it to file their federal and state income tax returns.

When should I receive my W-2? By January 31 each year, by federal law. If you have not received yours by mid-February, contact the employer's payroll or HR department first. If they cannot provide one, the IRS publishes a process for filing without it using a substitute form (Form 4852).

What's the difference between a W-2 and a 1099? A W-2 is for employees — workers whose employer withholds taxes and pays the matching half of Social Security and Medicare. A 1099 is for non-employees — independent contractors, freelancers, gig workers — who are responsible for paying their own income tax and the full self-employment tax. The forms report different income types and trigger different tax calculations.

What if my W-2 has an error? Contact the employer's payroll department first. They can issue a corrected W-2, called a W-2c, which supersedes the original. If the employer refuses or the error is uncorrected by the tax filing deadline, the IRS publishes guidance on how to file with an estimated W-2 and amend later when the corrected version arrives.

What if I have multiple W-2s from different jobs? Each employer issues a separate W-2 for the wages and taxes from that job. At tax time, you report every W-2 on the same federal return — most tax software lets you add multiple W-2s one after another. One thing to watch: if your total Social Security wages across all jobs exceed the annual wage base ($176,100 for 2025), each employer still withholds the 6.2% Social Security tax on their portion. You reconcile any overpayment on your tax return and claim the excess back.

Can I download my W-2 online? Most large employers now provide W-2s electronically through their payroll provider's portal (ADP, Workday, Gusto, Paychex, etc.) by the same January 31 deadline. Smaller employers may still mail paper W-2s. If you do not see yours in the portal by early February, contact payroll directly — and check that your address on file is current in case the paper copy was mailed to an old address.

In summary

A W-2 is the U.S. annual wage and tax statement that employers issue to each employee by January 31. It reports the year's wages, federal income tax withheld, Social Security and Medicare amounts, and state and local taxes. The numbers flow directly into the annual tax return and reconcile what was withheld against what was actually owed. Reading one doesn't require a tax professional — just a few minutes and the box-by-box explanations above.

The most useful single check on a fresh W-2 takes thirty seconds: compare Box 1 to the YTD gross on the last pay stub of the year, minus any traditional 401k contributions. If those two numbers don't match, something needs investigating before tax filing. After this overview, our companion piece on what a 1099 form is covers the equivalent for non-employee income, and the pay stub walkthrough shows the running totals that build up to the year-end W-2.

Reading a W-2 correctly is part of the wider financial-literacy toolkit — see the full map in our financial literacy explained overview.

Sources

• U.S. Internal Revenue Service, About Form W-2 — irs.gov/forms-pubs/about-form-w-2
• Investopedia, W-2 Form — investopedia.com/terms/w/w2form.asp
• Consumer Financial Protection Bureau — consumerfinance.gov