To find an employer's EIN, start with Box b of the employer-issued W-2 or ask payroll for the correct employer record. If you own the business and lost its EIN, check the IRS assignment notice, previous business tax returns, and authorized business records before using the IRS recovery process. Do not replace an unknown EIN with a personal SSN, a state account number, or a number guessed from an online directory.
This U.S. guide separates employee document checks from an authorized owner's recovery of a business tax ID. IRS sources were checked November 9, 2026. Finding a number and obtaining official confirmation of an assigned EIN are related but different tasks.
What is an EIN, and whose number is it?
An employer identification number is a federal tax identification number for a business or other entity. The IRS EIN guidance explains its purpose, assignment, confirmation, and recovery. It identifies the entity; it is not the individual employee's Social Security number or the employee's payroll ID.
The usual written format has two digits, a hyphen, and seven more digits. Correct formatting is only a first check. It does not verify the legal entity, the reporting relationship, or whether the number was copied accurately. A business's public brand and its legal payroll name can also differ.
Where is the EIN on a W-2?
Look for Box b, Employer identification number (EIN), and compare it with the employer name and address in Box c. The IRS W-2 instructions identify those fields and distinguish the employee's SSN in Box a, the control number in Box d, and state information in Box 15.
| Field | What it identifies | What to check |
|---|---|---|
| W-2 Box a | The employee's Social Security number | Do not use it as the employer EIN |
| W-2 Box b | The EIN used for the employer wage report | Match the reporting employer and wage year |
| W-2 Box c | The employer's name and address | Resolve unfamiliar legal or payroll reporting names |
| W-2 Box d | An optional control number | Not an EIN or employee SSN |
| W-2 Box 15 | State and employer state-ID information | Do not assume a state ID equals the federal EIN |
Use the actual statement for the relevant job and year. If you have several W-2s, do not copy one company's EIN into another company's record because the wage amount or brand looks familiar. Authorized agent arrangements can affect the reporting name and EIN: the IRS instructions describe agent reporting using the agent's EIN. Ask payroll to explain an unfamiliar reporting entity rather than changing it yourself.
If the W-2 is missing, follow the missing-W-2 request guide. If it appears to contain incorrect employer information, use the W-2 correction process instead of editing the employer's issued form.
Does every pay stub show the employer's EIN?
Do not assume it does. A statement may show an employer name, address, employee number, state tax account, or other payroll identifier. Read the complete label. A nine-digit number somewhere on the page is not enough to identify it as an EIN.
Ask payroll whether the statement displays the federal EIN and which employer entity it represents. The pay-stub reading guide helps distinguish employer details from employee identification, earnings, and deductions. A document layout by itself does not verify employment or the accuracy of the identifier entered.
How do you find your own business's lost EIN?
The IRS lists these starting points in its “Lost or forgot EIN” guidance:
- Look for the notice issued when the EIN was assigned.
- Contact the bank holding the business account, using its authorized verification process.
- Check with agencies where the business applied for state or local licenses.
- Look on previously filed business tax returns.
Confirm that the records belong to the same legal entity. Keep subsidiaries, related businesses, predecessor owners, and personal tax records separate. If conflicting numbers appear, do not choose the one that a software form happens to accept.
If you still cannot find it, the IRS EIN page directs authorized callers to the Business and Specialty Tax Line at 800-829-4933. The IRS verifies identity before providing the number to someone authorized to receive it. Check the official page for current service hours and contact details; a general search for a company's EIN does not give every caller authority to obtain its tax information.
What if a bank or agency needs official EIN confirmation?
Ask what evidence the recipient actually requires. The IRS lists three confirmation routes: an entity transcript, a digital CP575 available to eligible Business Tax Account users, or Letter 147C requested through its business tax line. Eligibility and identity checks still apply; do not assume every business or representative can use every option.
A number copied into a letter, invoice, or pay statement is not automatically the same evidence as an IRS confirmation. Preserve the confirmation securely and share it through the recipient's verified process. Do not upload business tax returns to an unverified lookup site merely to recover a number.
Should you apply for another EIN if the old number is missing?
Recover and confirm an existing assignment before assuming a new application is needed. The IRS says a business entity should have only one EIN and provides assistance when multiple EINs or entities create confusion. It also explains that a change in ownership or structure can require a new EIN, while a name, address, or responsible-party change does not by itself require a new one.
If a new EIN is actually needed, IRS issuance is free. Our SS-4 application guide distinguishes preparing application information from obtaining the EIN from the IRS. An optional document-preparation purchase is not an IRS issuance fee.
How should verified employer details be used in payroll documents?
Carry the correct legal name and identifier into the appropriate fields from verified records. Check them alongside the employee, pay period, pay date, and payroll totals. The employee pay-stub preparation checklist organizes those steps.
If you use the traditional check stub maker, review its actual employer fields and final preview against those records. A preparation tool cannot establish that an unknown EIN is correct merely because it accepts the typed value.
Common employer-EIN questions
Can I substitute a state employer number?
Not automatically. Federal EIN and state payroll identifiers serve different reporting systems. Use the identifier the specific field requests and confirm any uncertainty with payroll or the relevant agency.
Why is the legal name different from the store or brand name?
A public-facing name can differ from the entity or authorized agent reporting payroll. Confirm the relationship through payroll rather than assuming either that the form is fraudulent or that a matching brand proves the number is correct.
Will a generated pay stub recover a missing EIN?
No. Document preparation uses the information provided. Recover the number through employer records or an authorized IRS process before relying on it in a payroll or tax document.