The fastest EIN lookup is Box b of your W-2 — your employer's number is printed right there. No W-2 handy? Check a pay stub, ask payroll, search SEC…
By ExpertPaystubs Editorial Team. Published 2026-08-26
The fastest way to find your employer's EIN is Box b of your W-2 — it is printed on every copy, directly under your employer's name and address. An Employer Identification Number is the nine-digit number (format: XX-XXXXXXX) the IRS assigns to a business for tax purposes — effectively a Social Security number for a company. You typically need it to file your tax return, verify employment, or complete benefit paperwork, and there are only a handful of legitimate places to find one. Which method works depends on whose EIN you need: your employer's, a public company's, or your own business's.
Where to Find Your Employer's EIN
Work through these in order — the first two solve it for most people:
1. Box b of Your W-2
Every W-2 shows the employer's EIN in Box b ("Employer identification number"), in the upper-left area of the form, formatted XX-XXXXXXX. Any year's W-2 from that employer works — EINs do not change from year to year. If tax software rejects the number, re-check the transposition rather than the source; Box b is authoritative.
2. Your Pay Stub
Many payroll providers print the company's EIN on the stub itself, usually in the header near the employer's name and address (sometimes labeled "EIN," "Employer ID," "FEIN," or "Tax ID"). Not every stub includes it — states dictate what a stub must show, and an EIN is generally not on the required list — so treat this as a quick check, not a guarantee. If you don't recognize the fields on your stub, our guide on how to read a pay stub maps the standard layout.
3. Ask HR or Payroll
An EIN is not confidential — it appears on every W-2 and 1099 the company issues — so payroll or HR can simply give it to you. This is the standard route when you have no W-2 yet (a new job, or a first-year business) and the stub omits it. If you have already left the company, the payroll department or its provider (ADP, Paychex, etc.) can still provide it, the same way they can reissue pay stubs from a previous employer.
4. SEC EDGAR (Public Companies)
If the employer is publicly traded, its EIN is public record. Search the company on EDGAR (sec.gov), the SEC's filing database: annual reports (10-K) and quarterly reports (10-Q) list the "IRS Employer Identification No." on the cover page. Search by company name or ticker, open a recent filing, and the number is on page one. Free, official, and no login required.
5. Nonprofits: IRS Tax Exempt Organization Search
For charities and other tax-exempt organizations, the IRS's Tax Exempt Organization Search on irs.gov lists organizations along with their EINs, and a nonprofit's public Form 990 filings show the number as well.
One honest caveat: there is no free, official public directory of EINs for private companies. Websites promising a universal "EIN lookup" for any business are scraping secondary data and are often wrong or paywalled. For a private employer, the documents and people above are the reliable sources.
Can You Look Up an EIN Through the IRS?
Mostly no — and this is the biggest misconception about EIN lookups. The IRS does not operate a public EIN directory or search tool for private businesses. You cannot go to irs.gov, type in a company's name, and get its EIN. The two narrow exceptions:
- Tax-exempt organizations. The IRS's Tax Exempt Organization Search (irs.gov) is a genuine public database — nonprofits' EINs are searchable there because their filings are public by law.
- Your own business. The Business & Specialty Tax Line (800-829-4933) will read you your own entity's EIN after confirming you are an authorized person — owner, partner, or corporate officer. It will not disclose another company's number, including your employer's.
Any website claiming to offer an "IRS EIN lookup" for private companies is not connected to the IRS. For a private employer's EIN, the reliable sources remain your W-2 (Box b), your pay stub, or the payroll department.
Reverse EIN Lookup: Find a Company by Its EIN
Sometimes you have the opposite problem: a nine-digit number on a W-2, 1099, or pay stub, and no idea which company it belongs to — common after a staffing-agency job, a merger, or when payroll runs under an unfamiliar legal entity. Options for a reverse EIN lookup:
- SEC EDGAR full-text search. For public companies, searching the EIN on EDGAR (sec.gov) surfaces filings that carry the number on their cover page — free and authoritative.
- IRS Tax Exempt Organization Search. Accepts an EIN directly and returns the nonprofit it belongs to.
- Your own tax documents. The W-2 or 1099 carrying the EIN also carries the payer's legal name and address in the same block — the answer is usually printed an inch above the number. A parent company or payroll entity name (e.g., a franchise operator instead of the brand on the storefront) is normal.
- Commercial databases. Business-credit and data providers offer paid reverse-EIN searches compiled from filings; accuracy varies, and no free universal service exists for private companies.
If a reverse search turns up nothing anywhere, treat the document skeptically — an EIN that no filing, agency, or database has ever seen is one of the red flags covered in how to spot a fake pay stub.
How to Find Your Own Business's EIN
Misplaced the EIN for your own company? The IRS's guidance for a lost or misplaced EIN gives four confirmed routes:
| Method | Where to look |
|---|---|
| Your confirmation notice | The computer-generated CP 575 notice the IRS issued when your EIN application (Form SS-4) was approved |
| Bank and license records | The bank where you opened the business account, or any state/local agency you licensed with — both collected your EIN |
| Prior tax returns | Any previously filed federal return for the entity shows the EIN in the header |
| Call the IRS | The Business & Specialty Tax Line at 800-829-4933, Monday–Friday, 7 a.m.–7 p.m. local time (Alaska and Hawaii follow Pacific time). After verifying you are an authorized person — owner, partner, corporate officer — the agent gives you the number over the phone |
Never had an EIN? Applying is free on irs.gov through the online EIN assistant (the online application issues the number immediately), or by mailing or faxing Form SS-4. Ignore third-party sites that charge a "filing fee" for what the IRS does for nothing.
EIN vs. SSN vs. ITIN
Three different nine-digit tax IDs get confused constantly. They identify different things:
| EIN | SSN | ITIN | |
|---|---|---|---|
| Identifies | A business entity | An individual (work-eligible) | An individual not eligible for an SSN |
| Format | XX-XXXXXXX | XXX-XX-XXXX | XXX-XX-XXXX, always starts with 9 |
| Issued by | IRS | Social Security Administration | IRS |
| Typical use | Payroll taxes, business returns, W-2s/1099s, business bank accounts | Personal taxes, employment, benefits | Filing US taxes without work authorization |
| Appears on your paycheck documents? | Yes — employer's, in W-2 Box b | Yes — yours, in W-2 Box a | Rarely |
A sole proprietor with no employees can generally use their SSN for business taxes, but an EIN becomes mandatory once the business hires employees, forms a corporation or partnership, or files certain excise or retirement plan returns — and many banks require one to open a business account regardless.
When Do You Actually Need an Employer's EIN?
- Filing your tax return. Tax software asks for the EIN with each W-2 you enter; e-filing generally fails without it.
- A missing or late W-2. If you end up filing with Form 4852 (the substitute W-2), having the EIN from a stub or last year's W-2 strengthens the filing — our guide to filing taxes with your last pay stub walks through it.
- Verifying an employer is real. A stub whose employer cannot produce an EIN, or shows a malformed one, is a red flag — one of the checks in how to spot a fake pay stub.
- Benefits and loan paperwork. Some unemployment, immigration, and lender forms ask for the employer's EIN alongside employment dates.
- Running your own payroll. You need your EIN on every W-2 and 1099 you issue. If you generate W-2 forms or pay stubs for your business, the EIN belongs in the employer block, formatted XX-XXXXXXX.
Frequently Asked Questions
Is an EIN confidential?
No. It appears on every W-2 and 1099 a company issues and, for public companies and nonprofits, sits in public filings. That said, a business should still avoid publishing it gratuitously — fraudsters combine EINs with other data to file fake returns.
Can I look up any company's EIN for free?
Only certain kinds. Public companies: yes, via SEC EDGAR. Tax-exempt organizations: yes, via the IRS Tax Exempt Organization Search. Private companies: no official public lookup exists — get it from the company's own documents or payroll department.
Will the IRS tell me my employer's EIN over the phone?
No. The IRS's phone lookup (800-829-4933) is for authorized people retrieving their own business's EIN. For an employer's number, use your W-2, your stub, or HR.
Does an EIN ever change?
The number itself never changes for a given entity, but a business needs a new EIN when its structure changes — for example, a sole proprietorship incorporating, or a new partnership forming. That is why an old W-2 can occasionally show a different EIN than this year's: same company name, new legal entity.
What does an EIN look like on a pay stub?
Two digits, a hyphen, seven digits — e.g., 12-3456789 — usually near the employer's name, labeled EIN, FEIN, or Tax ID. Full glossary entry: Employer Identification Number.
The bottom line: for your employer's EIN, look at W-2 Box b first, your stub second, and payroll third; public companies are an EDGAR search away, and nonprofits are in the IRS's public database. For your own business, the CP 575 notice, your bank, an old return, or the IRS's 800-829-4933 line will recover it — and no route on this list costs a cent.