What’s a W-2 form? How to read it and who files it

The IRS doesn’t use a blockchain to process taxes, but it has its own “proof-of-work” reporting method. At the start of each year, millions of employers in the United States need to send W-2 forms, or annual income snapshots, to their employees.

Since the IRS takes income reporting seriously, there’s no room for errors or omissions on a W-2. Just one unintentional mistake could cost taxpayers serious money or trigger an IRS audit request. The best way to ensure everything goes smoothly this tax season is to learn the essentials: what a W-2 form is and the most common mistakes to avoid.

What’s a W-2 form?

A W-2 form is a tax document showing how much money an employee earned from a given company in the previous year. U.S.-based employers send W-2 forms, also known as Wage and Tax Statements, to their employees.

These forms include the full details on each employee’s total earned wages, as well as money withheld for federal, state and local taxes and programs like Social Security and Medicare. If the employer sponsors benefit programs like health insurance and retirement plans, then the W-2 will also include that financial information.

Why is a W-2 form important?

Without W-2 forms for employees, taxpayers can’t properly file their income taxes. Anyone who doesn’t submit the data from a W-2 in their tax reports doesn't have evidence to support their yearly income, which puts them in a vulnerable position for inaccuracies, delays, or IRS notices.

W-2 forms are also a reliable way to document your earnings for federal benefits like Medicare and Social Security. They show that you’re paying into these programs, so having the details in a W-2 form means you have a paper trail for the amount you’ve paid into by retirement age. Other services that need proof of income, like loans and financial assistance programs, also rely on the information reported on a W-2.

Who needs to file a W-2 form, and in what contexts?

Employers are responsible for preparing and providing W-2 forms to employees whenever any of the following apply:

1. If an employee earned over $600 in a year.
2. The employer withheld federal income tax, Social Security tax, or Medicare tax from the employee's wages.
3. If the employee didn’t claim an exemption from withholding on Form W-4 (or claimed no more than one withholding allowance on a W-4 before 2020), the employer would have had to withhold income taxes.

Anyone who’s self-employed, a freelancer, or an independent contractor won’t receive a W-2 form for that income. Instead, you’ll typically receive 1099 forms (like 1099-MISC or 1099-NEC) from your clients. Because clients don’t withhold taxes from your payments for you in this case, you’re responsible for paying your own income and self-employment taxes.

When are W-2 forms sent out?

Employees should receive their W-2 form with the prior year’s wage and tax information no later than January 31. Employers are also legally required to file W-2s with the Social Security Administration (SSA), which shares the data with the IRS, and applicable state and local tax agencies by the same date.

What if you don’t receive a W-2 form?

Individuals who don’t receive their W-2 form in the mail or electronically by the first week of February should contact their employer. In some cases, clerical errors like a misspelled email address or an outdated home address could be the reason for the delay. Make sure that you’ve double-checked your personal information on file before the end of the year, so your employer has the correct information. And document any effort to obtain the W-2 form in case you have any problems getting it before the filing deadline of April 15.

The IRS won’t waive penalties on a late tax payment or filing just because you don’t have your W-2 before April 15. Filing a tax extension with a Form 4868 gives you until October 15 to file your tax return, but it doesn’t extend the deadline to pay your taxes. If the April 15 deadline approaches and you don’t have your W-2 or filed an extension, consider consulting a tax professional to come up with the best course of action.

There’s a substitute for Form W-2 called Form 4852 that you can use in this situation to estimate your income. In this case, support the income estimate with official records like pay stubs.

Anyone who doesn’t file and pay their taxes by April 15 without an extension faces failure-to-file and failure-to-pay penalties from the IRS. The failure-to-file penalty is 5% of the unpaid tax per month, up to a maximum of 25% of the unpaid tax. The failure-to-pay penalty is 0.5% of the unpaid tax per month after the due date, up to a maximum of 25%. This rate can increase to 1% per month if the IRS issues a notice of intent to levy and the tax remains unpaid 10 days after the notice. If both penalties apply in the same month, the failure-to-file penalty is reduced by the failure-to-pay amount for that month.

What if you find an error on a W-2 form?

Although HR and payroll systems are getting better at catching discrepancies, don’t assume technology got everything right. Once you have the form, read through your W-2 with a keen eye for these common errors:

• Mistaken personal information: Before diving into the numbers, check all your personal information at the top of the W-2. Misspelled names, Social Security numbers with typos, and outdated home addresses are some of the most overlooked mistakes that can cause major headaches down the line.
• Incorrect wages or taxes withheld: Sometimes, a payroll processing glitch can create a mismatch between the total income listed on a W-2 and official pay stubs. Make sure to include any bonuses, commissions, and pay adjustments you received during the year when comparing the actual and reported W-2 results.
• Exceeding contribution limits: Overcontributing to tax-advantaged accounts like 401(k)s can result in additional taxes and penalties. To make sure you’ve been compliant with IRS rules, compare Box 12 on the W-2 with the IRS's contribution guidelines. If these contributions exceed the annual limit, contact your employer’s plan administrator to explore how you can return excess contributions and avoid IRS penalties.
• Mistakes in crypto reporting: Earning wages in crypto, versus fiat currency, is a new process, and not a straightforward one. This kind of income reported on a W-2 is uncommon, so any errors in digital asset reporting could raise red flags. If you earn crypto as compensation, maintain records like transaction hashes and timestamps to verify the fair market value (FMV) of the cryptocurrency at the time of payment. Working with a crypto-savvy tax professional and using tools like CoinTracker’s Portfolio Tracker will help you maintain a detailed record in case of audits.

If you spot any mistakes or discrepancies on your W-2 form, contact your employer to resolve the issue through HR or payroll. Employers will need to issue a Form W-2 C (Corrected Wage and Tax Statement) to you, the IRS, and the SSA with corrected information as soon as possible. You’ll use this updated information when filing your income tax return (assuming it arrives before tax filing day).

If the April 15 deadline is close and you don’t anticipate getting your Form W-2 C on time, you can file Form 4868 to request a tax filing extension to October 15. Just remember that the tax deadline extension only applies to filing your return: any taxes owed are still due by April 15.

How do you read a W-2 form?

W-2 forms might look confusing at first glance, but deciphering these documents is much easier when you focus on a few key sections:

• Box 1 (wages, tips, and other compensation): This section shows your total taxable wages for the prior year. If you received cryptocurrency as payment, this amount includes its FMV at the time of receipt.
• Box 2 (federal income tax withheld): This box provides the total federal income tax withheld from your wages for the year based on W-4 elections and your total taxable wages from Box 1.
• Boxes 3 and 4 (Social Security wages and tax withheld): Box 3 reports your wages that are subject to Social Security tax (up to the annual limit), which could be a different number from Box 1 based on your deductions and deferred compensation plans. Box 4 reflects how much Social Security tax was withheld.
• Boxes 5 and 6 (Medicare wages and tips and Medicare tax withheld): Boxes 5 and 6 report similar details to Boxes 3 and 4, but for Medicare rather than Social Security. Unlike Social Security wages, there is no annual wage base cap for Medicare taxes.
• Box 12 (additional compensation details): Box 12 includes information about your employer-sponsored benefits and special types of compensation, like retirement plan contributions and health savings account deposits. While most bonuses are reported in Box 1, specific benefits – like employer-paid life insurance or health insurance – may be listed here.
• Boxes 15, 16, and 17 (state wages and tax withheld): Box 15 indicates which state you’ve paid taxes to, along with the employer’s state ID number. Box 16 provides your state-level taxable wages, and Box 17 reports the total state income tax withheld throughout the year.

What do you do with a W-2 form for tax returns?

Reporting a W-2 involves two basic steps: First, double-check that all details are correct. Then, carefully transfer the information to your income tax return.

If you're working with a CPA or other tax professional, send your W-2s and any other tax forms (such as 1098s, 1099s, crypto capital gain details, and other relevant documents) to your preparer and answer any applicable questions listed in their questionnaire. They’ll prepare your tax return with this information.

If you’re filing independently, most tax software makes entering W-2 details straightforward with input screens that mirror the boxes on your W-2. Transfer the data box by box to ensure your income and withholdings are accurately reported.

If the W-2 includes state tax details in Boxes 15 through 17, enter these figures to ensure you also complete your state tax return properly. Most tax software automatically transfers this data from the federal section, but it’s best to review it each time to confirm it's accurate.

Some tax software also offers PDF uploads that scan the form and automatically input your information into the associated boxes. This option can save a little bit of time, but don’t assume that it’s automatically correct – check the numbers against your W-2 form to avoid errors.

Once you’ve reported your W-2 income, don’t forget to check for deductions and credits. These can lower your taxable income and reduce your overall tax bill. Common examples include deductions such as student loan interest and retirement account contributions, as well as credits like the earned income tax credit and child tax credit.

Get crypto tax guidance from CoinTracker

If you earn crypto as income from employment or freelance work, you might not get a W-2 form to document these digital assets. Instead, many crypto earners have to individually track and report their crypto transactions as miscellaneous income, capital gains, or losses, depending on the nature of each activity.

To take the stress out of recording all of these transfers yourself, CoinTracker links to hundreds of exchange APIs and crypto wallets to give you a complete picture of your annual Web3 activity. And while you can see information like your cost basis to use in your own calculations, you can also use CoinTracker to import this data into IRS forms like Form 8949 and Schedule D ready for a CPA, TurboTax, or H&R Block.

Tax time is approaching – are you prepared? Let us guide you through crypto tax essentials so you can stay on top of your filings.

Disclaimer: This post is informational only and is not intended as tax advice. For tax advice, please consult a tax professional.