Proof of EIN is the IRS letter confirming that your company has been assigned a unique Employer Identification Number. The most common format is the EIN Assignment Letter mailed shortly after the number is issued.
Whether you are opening a bank account, onboarding with a payment processor, renting commercial space, or filing with a state agency, you will be asked for proof of EIN—because these institutions must verify that your entity and tax ID match. Riveros Corp makes this process simple. We apply for your EIN as part of our formation bundle, support founders with or without SSN, and deliver a package that institutions recognize the first time. If your file will be used outside the United States, we also prepare the right path to apostille.
Proof of EIN: the documents that count
Not every piece of paper works. Here are the common documents that do serve as proof of EIN—and how they’re used.
1) IRS CP 575 — EIN Assignment Letter
What it is: The initial confirmation letter the IRS mails when it assigns the EIN. It lists your legal name, EIN, and the responsible party on IRS records.
Where it helps: Banks, PSPs, vendors, landlords, and government portals.
Caveat: If you never got it, or if the address was wrong, you may not have a CP 575—see the 147C option below.
2) IRS 147C — EIN Verification Letter
What it is: A re-issued confirmation letter that verifies the EIN and legal name as they appear in IRS systems.
Where it helps: Anywhere the CP 575 would work, especially when the original letter is lost.
3) What does not replace proof of EIN
SS-4 application (the form you use to request an EIN) is not proof of EIN.
A payroll report, old W-9, or an invoice with your EIN printed on it is not official proof.
Third-party emails or screenshots won’t satisfy banks or regulators.
Why institutions insist on proof of EIN
Compliance and risk: Banks and processors must match your entity name to your EIN to satisfy KYC/KYB rules.
Tax reporting: The IRS expects consistent names and EINs on forms like W-9 and 1099; issuers don’t want mismatches.
Fraud prevention: A genuine IRS letter signals that your number is real and tied to your legal name on government records.
Bottom line: having a clean, readable proof of EIN reduces back-and-forth and prevents onboarding delays.
How Riveros Corp secures your EIN (with or without SSN)
We’ve helped hundreds of founders—U.S.-based and international—obtain EINs correctly and deliver a proof of EIN package that works with banks and platforms.
Our acceptance-first workflow
Discovery: We confirm your entity data (name, formation state, responsible party, U.S. mailing address strategy), and whether any recipient (bank/PSP/landlord) has special formatting rules.
EIN application: We file your EIN through the correct IRS channel—with SSN or without SSN (using the procedures the IRS allows for non-U.S. founders).
Name and address hygiene: We make sure your entity name and address appear exactly the same across formation filings, EIN, W-9, and your bank onboarding forms.
Proof package: We deliver the CP 575 when available or guide the 147C request if the CP 575 was never issued or is missing.
Bank/KYB readiness: We include a clean W-9, authority language, and, if needed, officer or manager certificates processed directly through our Notary Public Center. This ensures your internal documents meet strict verification standards before they ever reach the bank. Timeframes may vary.
You don’t need to figure out IRS call menus or wonder which letter is acceptable—we do it for you and set up your folder for the next step (banking, PSP, or foreign filings).
If you lost your proof of EIN
It happens. The IRS can issue a 147C EIN Verification Letter after a quick identity check for the responsible party or authorized representative. Riveros Corp will guide you through the authorization steps and help you collect the 147C so you have a fresh proof of EIN to present.
Using proof of EIN abroad: apostille and alternatives
Sometimes a foreign bank, registry, or counterparty asks for proof of EIN in an international setting. Simply attaching the IRS letter often isn’t enough. Through our specialized division, Apostille de la Haya, we design a file that works outside the U.S.:
Hague Apostille route: Apostilles authenticate the signature and capacity of a public official. IRS letters are federal documents. While they can be apostilled directly by the U.S. Department of State, this process currently takes several weeks or months. To speed this up, depending on the destination’s rules, we typically:
Notarize a corporate officer’s affidavit that references the EIN and the IRS letter; then obtain the apostille on the notary’s signature, or
Obtain a state Certificate of Status/Good Standing or certified copy of Articles from your formation state and apostille the state official’s signature—many foreign banks prefer this as proof the entity exists and is active.
Non-Hague countries: We manage authentication and consular legalization instead of apostille.
Translations: If required, we coordinate a translator’s notarized statement and attach the apostille to the correct piece (translator statement or base certificate).
Riveros Corp confirms acceptance with the destination before filing, so you don’t sign twice. Timeframes may vary.
Proof of EIN in context: how it fits your formation and compliance kit
Your proof of EIN is one tile in a small mosaic. For frictionless onboarding, your folder should include:
Articles/Articles of Organization (or Incorporation) — filed with the state.
Bylaws or Operating Agreement — the governance rules banks ask to see.
EIN proof — CP 575 or 147C.
W-9 — matched to the EIN and legal name.
Authority certificates — manager/member or officer letters confirming who can open accounts and sign.
Certificate of Status/Good Standing — often needed by banks or foreign counterparties.
Riveros Corp prepares the entire package as part of our turnkey incorporation service, so your documents “speak the same language.”
Common mistakes we prevent
Using the SS-4 as proof: It’s only an application. Institutions want the CP 575 or 147C.
Name mismatches: “ABC LLC” vs. “A.B.C., LLC” can trigger KYB flags. We standardize the name and address everywhere.
Wrong letter for foreign use: Some destinations won’t rely on the IRS letter alone. We pivot to state certificates or a notarized officer affidavit plus apostille.
Waiting to request a 147C: If the CP 575 was lost, we request the 147C before bank appointments to avoid rescheduling.
Rushing apostille without a plan: We confirm how the foreign recipient prefers the proof—apostille on a state certificate vs. on a notarized affidavit referencing the EIN—so your first submission is accepted.
Why choose Riveros Corp
Turnkey incorporation with EIN acquisition for founders with or without SSN.
Acceptance-first documentation: names and addresses aligned across state filings, EIN, W-9, and bank/KYB forms.
Notarization & apostille when a recipient requires it—designed for the exact bank, agency, or foreign authority you’re dealing with.
Clear communication and realistic scheduling—because timeframes may vary.
Need proof of EIN that banks and agencies will accept—plus the right apostille strategy for foreign use? Contact Riveros Corp. We’ll secure your EIN, deliver the IRS letter (CP 575 or 147C), align your documents for onboarding, and handle any notarization and apostille your case requires. Let’s get it right the first time.
FAQ
1) What exactly qualifies as proof of EIN?
The IRS CP 575 EIN Assignment Letter or the IRS 147C EIN Verification Letter. These come from the IRS and state your legal name and EIN.
2) I don’t have an SSN. Can I still get an EIN?
Yes. Riveros Corp obtains EINs for founders with or without SSN using the IRS’s permitted procedures for non-U.S. applicants.
3) Can the SS-4 application serve as proof of EIN?
No. The SS-4 is only your application. Banks and agencies want the CP 575 or 147C.
The information contained in this publication is provided for general informational purposes only and does not constitute legal advice. Reading or using this content does not create and is not intended to create an attorney-client relationship. No reader or user should act or refrain from acting based on the information presented herein without first consulting an attorney duly licensed to practice law in their jurisdiction.
