Wisconsin EIN Lookup
Last updated November 5, 2026 · Written by the EIN Registration filing team
Look up a Wisconsin company
Wisconsin only allows its search on its own site, so this opens in a new tab. It finds the company, not usually its EIN.
No EIN yet for your Wisconsin business?
We file the SS-4 for you. EIN typically emailed in 2 to 4 business days (about 11 by fax).
Where to look in Wisconsin
- Wisconsin corporate records search. Search by entity name or DFI Entity ID. Use it to confirm the company's exact name and status.
- Wisconsin Tax Account Lookup. Works from the federal number: enter a business's FEIN and legal name, and it returns the seller's permit status and 15-digit permit number. You need the FEIN first, so it does not reveal one, but it is a useful check on a number you were given.
Wisconsin numbers that get mistaken for an EIN
None of these is the nine-digit federal number unless the table says so. A bank, payroll company or client asking for your EIN wants the one the IRS issued.
| Used for | Issued by | The number |
|---|---|---|
| Company formation | Wisconsin Department of Financial Institutions | entity ID |
| State income tax withholding | Wisconsin Department of Revenue | Withholding tax number, 15 digits, shown as 036-0000000000-00 |
| Unemployment insurance | Wisconsin Department of Workforce Development | UI account number |
| Sales tax | Wisconsin Department of Revenue | Seller's permit |
Finding your own Wisconsin company’s EIN
Start with the CP 575 letter the IRS sent when the number was issued, then a past federal return, your bank’s account paperwork and your payroll provider. If none of those has it, the responsible party can call the IRS and ask for a 147C letter. Do not apply again to replace a lost number: a second application creates a second EIN for the same company.
Finding another Wisconsin company’s EIN
If you pay them, ask for a Form W-9: it is the normal way to get the number, and you need it for a 1099 anyway. Nonprofits are in the IRS Tax Exempt Organization Search, and public companies print theirs on SEC filings. For a private Wisconsin company with no reason to give it to you, there is no free public source that is complete. To check a number you were given, see how to verify an EIN.
Wisconsin EIN lookup questions
Does Wisconsin have an EIN lookup?
The EIN is federal, so the IRS issues it and Wisconsin does not. Wisconsin corporate records search finds a company by entity name or DFI Entity ID. Do not count on it for the federal number. The reliable sources are the company itself, on a Form W-9, or your own IRS paperwork if the company is yours.
Is my Wisconsin entity ID my EIN?
No. The entity ID comes from the Wisconsin Department of Financial Institutions and identifies your company in state records. The EIN comes from the IRS, and a bank or payroll company asking for one will not accept the state number.
I formed my Wisconsin company but never got an EIN. What now?
Forming the company does not create an EIN. You apply separately with the IRS on Form SS-4, or a service like ours prepares and files it for you. If you might already have one, check first: applying again gives the same company a second number.
Get Your EIN the Easy Way
Answer a few questions in about 5 minutes. Our specialists prepare your IRS Form SS-4, file it, personally handle any rejection or name conflict along the way, and get your EIN to you, typically within 2 to 4 business days, or about 11 when the IRS requires the application by fax. One flat $197 service fee. No upsells, no subscriptions.
- ✓ Prepared and filed by specialists
- ✓ Error 101 and rejection handling included
- ✓ Data encrypted (AES-256)
- ✓ Order tracking and email updates
Related guides
You can also apply for an EIN directly with the IRS at irs.gov at no cost.