International EIN application: phone vs. fax vs. mail.

Start with location—and where the entity was organized

The word “international” is easy to misuse. The owner’s citizenship, the state where an LLC was formed, the applicant entity’s legal residence and its principal place of business are different facts. The Form SS-4 instructions use specific location conditions for each route.

The fax and mail routing tables ask whether the applicant has a legal residence, principal place of business, or principal office or agency in a U.S. state or the District of Columbia. Phone adds two conditions: none of those connections may exist in the United States or U.S. territories, and current IRS processing limits the line to a principal business created or organized outside the United States and its territories.

Phone: a live route for eligible foreign-organized businesses

The March 2026 IRS procedural update tells representatives to treat a corporation or LLC organized in the United States or a U.S. territory as domestic and direct that caller to other application methods. Foreign ownership, a foreign responsible party and foreign operations do not override the organizing jurisdiction.

Complete Form SS-4 before calling. The IRS representative uses those answers to establish the account, and the caller must be authorized to receive the EIN and answer questions about the application. The responsible party can call; a third party needs valid authorization.

If an EIN is assigned, write it on the upper-right corner of the completed form, sign and date the copy, and keep it in the entity’s records. If the representative asks for the signed Form SS-4, the current instructions say to mail or fax it, including any third-party authorization, within 24 hours to the destination the representative provides.

A live call does not promise assignment. Authentication, incomplete answers, system availability or an existing EIN can prevent the representative from completing the request during that call.

Fax: a documented transmission and return channel

For an applicant with no qualifying legal residence, principal place of business, or principal office or agency in any state or the District of Columbia, the current international-route numbers are:

The IRS describes fax assignment as generally taking four business days. To receive the response by fax, provide a working return-fax number. The IRS now sends a cover sheet containing the EIN rather than returning Form SS-4 with the number written on it.

Keep the final signed form, cover page, destination number, timestamp, page count and successful transmission report. Those records show what was sent; they do not prove that the application was complete or that an EIN was assigned.

Mail: the same form without a fax service

An applicant with no qualifying connection in a state or the District of Columbia mails the signed application to:

The current instructions say to complete Form SS-4 at least four to five weeks before the EIN is needed and describe an approximate four-week mailed response. Postal transit, IRS inventory and an incomplete application can make the practical wait longer. Use a delivery method that produces appropriate evidence for the sender’s country, and keep a complete copy of the package.

Do not add an unofficial street address found in an old article. The IRS publishes the city and ZIP destination above for EIN International Operation and can revise routing guidance.

Choose by eligibility, access and evidence

Cost also differs. The international phone number is not toll-free, fax providers may charge for sending and receiving, and tracked international mail can be expensive. Those provider costs do not make an unofficial intermediary an IRS filing service.

All three methods depend on the same preparation

1. Confirm the exact legal name from the formation record.
2. Identify the individual responsible party and complete line 7b correctly.
3. Resolve LLC member count and line 9a entity treatment.
4. State the real reason for applying on line 10.
5. Prepare the dates, employee counts, principal activity and prior-EIN answer.
6. Confirm who is authorized to sign or speak for the applicant.

A faster transmission method cannot repair a conflicting legal name, incomplete responsible-party entry or inaccurate entity classification. Review the current official form immediately before the call or submission.

Do not switch methods merely because the response is late

The Form SS-4 instructions say to use only one method for each entity so it does not receive more than one EIN. They also limit receipt to one EIN per responsible party per business day across online, phone, fax and mail.

If a fax or mailed application is delayed, first preserve the delivery evidence, confirm the published processing context and determine whether the IRS requested missing information. Starting a second application can turn a service delay into a duplicate-account problem.

What about the IRS online application?

Online EIN assignment is a separate route. The current instructions limit it to applicants with a qualifying U.S. or U.S.-territory connection and require the relevant principal officer, partner, owner or other responsible person to have a valid taxpayer identification number for the online process. A foreign owner’s inability to use the online system does not, by itself, decide which fax number is correct or make the international phone route available.