How a bank verifies an EIN — and the five reasons it refuses one

Verified on November 5, 2026 against the IRS page “Employer Identification Number”, the FinCEN Customer Identification Program rule, and the IRS sources cited in full at the foot of this entry.

§ 1 —What the bank is actually checking

A US bank is required to run a Customer Identification Program: the FinCEN rule at 31 CFR 1020.220 obliges each bank to maintain a written programme that obtains identifying information from a person opening an account and verifies their identity, so the bank can form a reasonable belief that it knows who its customer is. For a company, the identifying information the programme works on is the company's name, address, and its identification number — the EIN. That duty is the bank's, imposed on the bank, and it exists whether or not the EIN is valid: an entirely genuine EIN attached to a file the bank cannot verify to its own standard will still be refused, and the refusal says nothing about the number.

The evidence banks ask for is therefore documentary, and for the EIN it is specific: the CP 575, the confirmation notice the IRS issued once at assignment, or Letter 147C, the IRS verification letter requested when the CP 575 is lost — each proving, in the IRS's own print, the EIN and the name and address currently on file (REF C-1).¹ The IRS now also makes a digital CP 575 available to eligible Business Tax Account users, which it states can be used as a substitute for the original CP 575 notice series and for Letter 147C. What none of these documents proves is ownership or control — which is why the bank separately examines formation documents and identification for the people behind the company. Two verifications, two files, one application: most refusals are a failure in one file being reported as a failure of the other.

§ 2 —The new-EIN lag — stated only as far as the sources go

The IRS publishes the one interval that matters here: a new EIN “can be used immediately for most business needs” — its own examples include opening a bank account — while a filer should wait up to two weeks for the number to pass the IRS's TIN Matching Program and to e-file a return. A bank check that draws, directly or through a vendor, on data refreshed from IRS-linked systems can therefore fail on a days-old EIN that will pass the same check later in the month.

Beyond that published window, this entry prints nothing. No IRS or FinCEN source publishes a universal interval after which “the EIN works at banks,” and the figure repeated in founder folklore — a fixed number of business days after which verification is guaranteed — appears in no primary source this library can cite. Each institution's systems refresh on their own schedule. The honest statement is: the lag is real, the IRS-published part of it is up to two weeks, and the institution-specific part is unpublished and variable. A founder told a precise day-count by a formation seller has been given folklore, priced.

§ 3 —The five refusals, each as a diagnosed type

(i) Name or name-control mismatch. The name presented differs from the name the IRS recorded — a misspelling at assignment, a later legal change never reported, or the trade name offered where the legal name belongs. The diagnosis and its cures are REF E-1; the correction route for a record that is itself wrong is REF C-2.

(ii) The document offered is neither CP 575 nor 147C. A copy of the filed SS-4 proves an application was made; a state certificate proves the company was formed; a screenshot proves a screenshot. None is IRS-issued evidence of the number and the name on file. The cure is documentary, not argumentative: produce the CP 575, or request Letter 147C (REF C-1).

(iii) The EIN was issued to a differently-named entity. The formation name and the SS-4 name diverged — a word dropped, a designator changed, an earlier draft name filed. The IRS record follows the SS-4, so the verification is being run against the name on the notice, not the name on the certificate. Which name should stand is a correction question (REF C-2), settled before the account application is re-presented.

(iv) The refusal is the bank's KYC, not an EIN defect. Questions about who owns and controls the company, where its money originates, and what it will do are the Customer Identification Program at work (§ 1) — the bank discharging its own duty. No IRS correction exists for them, because nothing at the IRS is wrong; they are answered with ownership and activity evidence, or not at all, and a different bank may weigh the same file differently. This is the refusal founders most often misreport as “my EIN was rejected.”

(v) The number belongs to a different record than the account requested. An owner's other company, a predecessor entity, a number obtained for a different structure: the IRS's position is that a business entity should have only one EIN — and, by the same token, each entity's account is verified against its own. Presenting entity A's number for entity B fails correctly.

§ 4 —What cures each — and where the worked help lives

The reference routes are short. For a lost notice: Letter 147C, REF C-1. For a wrong name or address on the record: REF C-2, and Form 8822-B for address and responsible-party changes, REF B-5. For a name that will not match anywhere: REF E-1, before any re-application. The accompanied, worked remedy for a live refusal — the sequence carried out on a real application — is a filing desk's work, handed off to EIN Without SSN; and the account-opening examination itself, platform by platform, is the depth of US Bank for Non-Residents. This library's entries end, as they begin, at the reference: what the bank is checking is now, at least, no longer a mystery — and a refusal that can be named can be cured. Put the underlying question to the Catalogue Enquiry if it is still unnamed.

General information only, not tax, legal, or banking advice. Where this page and a cited source differ, the cited source governs.