EIN for an LLC: Requirements and Application Guide

Updated September 2026

An Employer Identification Number (EIN) is a nine-digit federal tax identification number issued by the IRS. It identifies an LLC or another entity for federal tax filing and reporting.

Not every LLC is legally required to obtain an EIN. The answer depends on the LLC’s federal tax classification, employees, tax filings, and business needs.

When Does an LLC Need an EIN?

An LLC needs an EIN when federal rules require a separate business tax account. Common cases include:

a multi-member LLC taxed as a partnership;
an LLC taxed as a corporation;
an LLC with employees;
an LLC filing employment, excise, alcohol, tobacco, or firearms tax returns; and
an LLC that must use an EIN under another federal tax rule.

A single-member LLC that is disregarded for federal income tax purposes and has no employees or excise-tax filing can sometimes use the owner’s taxpayer identification number for federal income-tax reporting. It can still obtain an EIN for banking or other legitimate business purposes.

EIN and ITIN Are Different

An EIN identifies a business or other entity. An ITIN identifies an individual who needs a U.S. taxpayer identification number for a federal tax purpose and is not eligible for an SSN.

Form SS-4 is used to apply for an EIN. Form W-7 is used to apply for an ITIN. A single-member LLC does not apply for its EIN on Form W-7.

Form the LLC Before Applying

The IRS advises applicants to form the legal entity with the state before applying for an EIN. Use the exact legal name shown on the approved formation document. Applying before formation can create mismatched records or require correction.

Information Required for Form SS-4

Prepare the following information before applying:

the LLC’s exact legal name and any trade name;
the mailing and physical addresses;
the formation state and formation date;
the number of LLC members;
the LLC’s federal tax classification;
the principal business activity;
the reason for applying;
the first date wages were paid, if applicable; and
the responsible party’s name and taxpayer identification information.

Who Is the Responsible Party?

The responsible party is the individual who owns, controls, or effectively controls the entity and its funds or assets. The responsible party must be a person, not another business entity, except for a government entity.

Use the true responsible party. A nominee, formation company, or registered agent must not be listed merely because that person prepared or submitted the application.

If the responsible party later changes, the entity must report the change to the IRS on Form 8822-B within 60 days.

How U.S. Applicants Apply

An applicant with a legal residence, principal place of business, or principal office or agency in the United States or a U.S. territory can use the IRS online EIN application when eligible. The IRS issues the EIN immediately online when it approves the application.

The IRS does not charge for an EIN. Avoid websites that present a private service fee as an IRS fee.

How International Applicants Apply

An applicant with no legal residence, principal place of business, or principal office or agency in the United States or a U.S. territory cannot use the online EIN application.

International applicants can apply by:

telephone at 267-941-1099, Monday through Friday, 6 a.m. to 11 p.m. Eastern time;
fax using the number stated in the current Form SS-4 instructions; or
mail to the IRS EIN International Operation address stated in the current instructions.

Telephone service is available only to international applicants. The person calling must be authorized to answer the Form SS-4 questions.

Does a Foreign Owner Need an ITIN First?

A foreign responsible party does not always need an ITIN before the LLC applies for an EIN. The correct entry on Form SS-4 depends on the responsible party’s facts and the current IRS instructions. Do not obtain or use an ITIN solely because a bank, formation provider, or inaccurate website assumes it is required for every EIN application.

Application Limit and Duplicate EINs

The IRS limits issuance to one EIN per responsible party per day, regardless of whether the application is made online, by telephone, fax, or mail.

Use only one application method for the same LLC. Submitting several applications can create duplicate EINs and record problems.

After the EIN Is Issued

Keep the EIN assignment notice with the LLC’s permanent records. Review it immediately to confirm the legal name and address.

An EIN does not:

change the LLC’s federal tax classification;
create tax-exempt status;
authorize employment or change immigration status;
replace state tax registration or business licences; or
prove that the LLC is active or in good standing.

When Does an LLC Need a New EIN?

A simple change of business name, address, or registered agent does not normally require a new EIN. A new EIN can be required when ownership or entity structure changes in a way described by IRS rules. Review the facts before applying again.

Frequently Asked Questions

Does every LLC need an EIN?

No. Many LLCs do, but a disregarded single-member LLC with no employees or excise-tax filing can fall outside the federal requirement. Banks and other institutions can still require an EIN.

Is an EIN free?

Yes. The IRS does not charge an EIN application fee. A professional can charge a service fee for preparing and submitting Form SS-4.

Can a foreign-owned LLC apply online?

Not when the applicant has no legal residence, principal place of business, or principal office or agency in the United States or a U.S. territory. It must use an international application method.

Can I use my registered-agent address?

Use each Form SS-4 address line for its stated purpose. A registered-agent address should not be presented as the LLC’s physical business location unless it truthfully serves that function.

Does an EIN expire?

No. An EIN does not expire. The IRS can deactivate an account in limited situations, but the number is not reassigned to another entity.

Does changing the LLC name require a new EIN?

No. A name change alone does not require a new EIN. The LLC must notify the IRS using the procedure that applies to its tax classification.

Get Help With an EIN Application

4SYTE helps U.S. and foreign LLC owners prepare Form SS-4, select the correct application method, and avoid name, address, classification, and responsible-party errors.

Learn about our LLC formation service or contact us for EIN assistance.