What Is an EIN? A Plain-Language Guide for Business Owners

An Employer Identification Number (EIN) is a nine-digit federal tax identifier issued by the US Internal Revenue Service. It identifies a business entity to the IRS the way a Social Security Number identifies an individual for many US tax purposes. You can need an EIN even if you never hire anyone. The word “Employer” is historical. Banks, payment processors, and some state agencies ask for it because they want a federal ID that is not your personal SSN.

Scriplit is not a law firm or a CPA firm. This article is general information, not tax or legal advice. Confirm current IRS rules before you apply. An EIN does not guarantee banking, Stripe, visas, or any particular tax outcome.

What the number is for

The IRS uses EINs on federal tax and information returns. A US LLC that is a corporation, a partnership, or a multi-member LLC generally needs one. A single-member LLC that is disregarded for federal income tax may still need an EIN for banking, for hiring, for excise tax, or because a payer or platform refuses to work without one. Foreign-owned single-member LLCs commonly obtain an EIN because banks want it and because certain information returns use it.

The EIN is not a license to operate, not a sales-tax permit, not a VAT number, and not proof of immigration status. It does not mean the IRS “approved your business model.” It means they issued an identifier and associated it with the application you filed.

Format: two digits, hyphen, seven digits (for example, a pattern like 12-3456789). Treat it like a secret that is shared when a form requires it, not like a marketing slogan on a homepage.

EIN vs other US numbers

People confuse EIN, SSN, and ITIN because all three appear on tax forms. They are not substitutes. An SSN is a personal number. An ITIN is a personal taxpayer number for people who need to file US tax forms but are not eligible for an SSN. An EIN is for the entity (or for a sole proprietor in some cases). A short comparison lives in EIN vs SSN vs ITIN. Do not write an SSN in a field that asked for the company’s EIN, and do not invent an EIN by rearranging a passport number.

When businesses typically apply

Common triggers:

• Opening a US business bank or fintech account that lists EIN as required.
• Applying to a processor that underwrites a US legal entity.
• Hiring employees or using a US payroll provider.
• Filing federal returns that require an EIN.
• Receiving a Form W-9 request from a US payer who needs a federal ID for the entity.

You generally apply after the LLC exists, because the application asks for the entity’s legal name and formation details. Applying with a name the state has not approved yet produces mismatches.

How the IRS issues it (high level)

The IRS offers an online EIN assistant for applicants who can complete it. That assistant is built around responsible parties who have an SSN or ITIN. Foreign owners without those numbers typically cannot finish the online path. They use Form SS-4 by fax or mail (and sometimes other IRS channels the IRS describes in current instructions). Processing time is not a published guarantee; it varies with IRS workload and whether the form was complete. See how to get an EIN for a foreign-owned LLC for that path.

Third-party designees (an accountant or formation service you authorize on the form) can receive the number to pass to you. Authorization is a checkbox and a signature process, not a way to skip identity questions. The IRS can still reject or delay incomplete applications.

What you receive

Successful applicants get a confirmation. Historically this has been a CP 575 notice. If you lose it, the IRS has a process to request a 147C letter that confirms the EIN. Keep a PDF and a paper copy. You will be asked for this letter years later when a bank employee is having a bad day. After it arrives, use the number consistently — that aftercare is covered in after you receive your EIN.

There is no “EIN card” you laminate. Screenshots of a third-party dashboard are not an IRS letter. If a vendor only shows the digits in their portal, still obtain the IRS document.

What an EIN does not do

• It does not replace state formation or a registered agent.
• It does not enroll you in E-Verify or grant work authorization.
• It does not register you for state unemployment or sales tax by itself.
• It does not make a disregarded LLC “a corporation” unless you file a classification election.
• It does not expire on a published annual schedule the way some licenses do. Forgotten companies still have the same number; they may have other problems.

Scams and “expedite” offers

The IRS does not call you to demand gift cards to issue an EIN. Websites that look like IRS.gov and charge a huge “government fee” on top of the actual free IRS issuance are a red flag. Formation services can charge for preparation and faxing; that is a service fee, not an IRS tariff. If someone promises a number in one hour for every foreign-owned LLC, treat it as marketing. The IRS controls issuance speed.

If you already have a foreign tax ID

A Companies House number, an Australian ABN, or a Canadian BN is not an EIN. US banks want the IRS number when they ask for an EIN. You may need both: home-country IDs for home-country filings, EIN for US forms and US counterparties.

If you want help applying as part of a formation package, see US LLC formation or contact Scriplit. Bring the stamped articles and the responsible party’s passport details as the IRS form currently requires. We prepare and submit; we do not issue numbers, and we cannot honestly quote a fixed IRS turnaround.