Your EIN appears in Box b on the W2, in the upper right section

The Employer Identification Number (EIN) is printed in Box b of your W2 form. This is the nine-digit number that identifies your employer to the IRS. It sits in the upper right area of the form, just below the employer's name and address. The format is always XX-XXXXXXX (two digits, hyphen, seven digits).

If you are looking at a paper W2, Box b is easy to spot — it is labeled clearly and sits to the right of the employer information section. If you received your W2 electronically or are viewing it as a PDF, the same box location applies. The EIN is separate from your own Social Security Number, which appears in Box a on the left side of the form.

Key Takeaways

  • Box b on your W2 contains your employer's nine-digit EIN in the format XX-XXXXXXX.
  • The EIN is located in the upper right portion of the form, below the employer's name and address block.
  • You may need the EIN if you are filing taxes, contacting the IRS about your employer, or verifying employment information.
  • If Box b is blank or missing, contact your employer's payroll department to request a corrected W2.

Why your employer's EIN matters on your W2

The EIN tells the IRS which business paid you. When you file your tax return, the IRS matches the EIN on your W2 to the employer's tax records. This confirms that your employer reported the same income to the IRS that they reported to you. If there is a mismatch — for example, if your W2 shows income but the employer never filed a return — the IRS will flag it.

The EIN also matters if you need to contact the IRS about your employer or if you are disputing information on your W2. The IRS uses the EIN to pull up the employer's file and investigate. You may also need it if you are verifying employment for a loan, rental application, or background check.

What to do if Box b is blank or illegible

If your W2 has no EIN in Box b, or if the number is smudged or unclear, contact your employer's payroll or human resources department. Ask them to provide a corrected W2 (called a W2-c). Do not guess or try to look up the number yourself — the IRS requires the exact EIN your employer used when filing their own tax return.

Your employer is required by law to issue you a W2 with their correct EIN by January 31 of the year following the one in which you earned the income. If you do not receive a corrected form within a reasonable time, you can file Form 4852 (Substitute for Form W-2) with the IRS when you file your own return, but this is more complicated and may trigger an audit. It is faster to get the correct W2 from your employer first.

How the EIN differs from other employer identifiers

Your employer may have multiple identification numbers, and it is important not to confuse them. The EIN is the federal tax ID. Some employers also have a state tax ID number, which is different and used only for state taxes. Your employer may also have a FEIN (Federal Employer Identification Number) — this is just another name for the same thing as the EIN.

On your W2, only the EIN (in Box b) matters for federal tax purposes. State tax information, if included, appears in a separate section at the bottom of the form. If you are filing taxes in multiple states, you may need to look up your employer's state ID separately, but that is not on the W2 itself.

Using the EIN to verify your W2 information

If you suspect your W2 contains errors — wrong income amount, wrong name, wrong address — you can use the EIN to contact the IRS directly. Call the IRS at 1-800-829-1040 and have your W2 and the employer's EIN ready. The IRS can tell you what information they have on file for that employer and help you figure out whether the problem is on your W2 or in the employer's records.

You can also look up an employer's EIN on the IRS website using their business name and address, though this is usually only necessary if you lost your W2 and need to reconstruct the information. The IRS maintains a searchable database, but it may take a few weeks for newly issued EINs to appear.

Frequently Asked Questions

Can I use the EIN from my W2 to look up my employer's business information?

Yes. The EIN is public information, and you can use it to search the IRS website or your state's business database to confirm your employer's legal name, address, and filing status. This can be useful if you are verifying that you worked for a legitimate business or if you need to contact them for a corrected W2.

What if my W2 shows two different EINs?

This can happen if your employer was acquired, merged, or reorganized during the year you worked there. Contact payroll to confirm which EIN is correct for the income shown. If you are unsure which one to use when filing your taxes, include both on your return or call the IRS for guidance before filing.

Do I need the EIN to file my taxes?

No. You file your personal tax return using your own Social Security Number. However, the IRS uses the EIN on your W2 to match your reported income against your employer's records. If the EIN is wrong or missing, it may delay processing of your return.

Is the EIN the same as my employer's business license number?

No. The EIN is a federal tax ID issued by the IRS. A business license number is issued by your state or local government and is used for different purposes. Only the EIN appears on your W2.