Submitting SS-4 by Fax: Preserve the Complete Application and Transmission Record
· 6 min read
The practical answer
A fax application is easier to audit when the retained copy shows what was actually sent, not just that a machine reported transmission. Organize the application pages and the transmission record together so a later inquiry can identify the submission precisely. Three details shape the review: Which exact application copy was transmitted? Are all intended pages legible and present? What does the retained transmission record actually show?[1] [2, p.6] [3, p.1] [2, p.3]
Scope and the records behind the answer
The discussion follows the entity, form and transaction conditions identified below. The same label on a different form can have a different purpose. Keep the relevant entity and reporting period visible while you compare the requirements, and treat each stated exception as part of the rule rather than an optional footnote.
Official sources checked: 2026-11-09. Annual tax-year forms and continuously revised forms are identified separately in the references.
A side-by-side preparation table
| Item or question | Official rule or instruction | Conditions and limits | Source |
|---|---|---|---|
| Ein international submission routes | The IRS EIN page gives phone, fax and mail routes for applicants whose principal place of business is outside the United States. | Scope is principal place of business, not citizenship alone; recheck current recipient details before submission. | [1] |
| Ein domestic fax mail routes | For a U.S. principal place of business, the IRS EIN page lists online, fax and mail routes and warns that inventory levels can delay processing. | Online-tool eligibility has its own requirements; IRS estimates are not a company delivery promise. | [1] |
| Authorized signer | The authorized SS-4 signer depends on the type of applicant. A foreign applicant may use a person with appropriate authorization to sign. | Apply this entry within the entity, form and period described here; read the cited passage for the surrounding context. | [2, p.6] |
| Field/section 4a: Mailing address (room, apt., suite no. and street, or P.O. box) | Enter the mailing address for IRS correspondence, including room, suite and other applicable address details. | Apply this entry within the entity, form and period described here; read the cited passage for the surrounding context. | [3, p.1] [2, p.3] |
| Field/section 4b: City, state, and ZIP code (if foreign, see instructions) | For a foreign address, include the city, province or state, postal code and full country name. Do not abbreviate the country name. | Apply this entry within the entity, form and period described here; read the cited passage for the surrounding context. | [3, p.1] [2, p.3] |
| Field/section Signature / date / name and title: Signature Date | The appropriately authorized person for the applicant type signs, dates and identifies their name and title. Third-party designee authorization requires completion of the signature section. | Apply this entry within the entity, form and period described here; read the cited passage for the surrounding context. | [3, p.1] [2, p.6] |
Work through the official requirements
Ein international submission routes
The IRS EIN page gives phone, fax and mail routes for applicants whose principal place of business is outside the United States.[1]
This applies when: Scope is principal place of business, not citizenship alone; recheck current recipient details before submission.
Ein domestic fax mail routes
For a U.S. principal place of business, the IRS EIN page lists online, fax and mail routes and warns that inventory levels can delay processing.[1]
This applies when: Online-tool eligibility has its own requirements; IRS estimates are not a company delivery promise.
Authorized signer
The authorized SS-4 signer depends on the type of applicant. A foreign applicant may use a person with appropriate authorization to sign.[2, p.6]
Field/section 4a: Mailing address (room, apt., suite no. and street, or P.O. box)
Enter the mailing address for IRS correspondence, including room, suite and other applicable address details.[3, p.1] [2, p.3]
Field/section 4b: City, state, and ZIP code (if foreign, see instructions)
For a foreign address, include the city, province or state, postal code and full country name. Do not abbreviate the country name.[3, p.1] [2, p.3]
Field/section Signature / date / name and title: Signature Date
The appropriately authorized person for the applicant type signs, dates and identifies their name and title. Third-party designee authorization requires completion of the signature section.[3, p.1] [2, p.6]
Field/section 8a: Is this application for a limited liability company (LLC) (or a foreign equivalent)?
Answer whether the applicant is an LLC or a similar foreign entity.[3, p.1] [2, p.3]
Field/section 10: Reason for applying (check only one box)
Select one accurate application reason. A foreign-owned U.S. disregarded entity subject to Form 5472 follows the instructions' Other-reason wording.[3, p.1] [2, p.5]
Field/section 2: Trade name of business (if different from name on line 1)
Complete this line only if the trade name or DBA differs from the legal name on line 1.[3, p.1] [2, p.3]
An illustrative preparation scenario
In this hypothetical preparation example, a founder has a fax report but cannot locate the version of SS-4 that accompanied it. The preparer reconstructs the document file from the retained application and distinguishes document completeness from the transmission record, without treating the report as a promise of assignment. The preparer checks three points: Which exact application copy was transmitted? Are all intended pages legible and present? What does the retained transmission record actually show? The file remains a working comparison until the relevant facts and applicable instructions have been checked together. No agency outcome is assumed.[1] [2, p.6] [3, p.1] [2, p.3]
This is a planning illustration, not a statement that a particular filing has been accepted or that an entity qualifies for a tax result. Use the source-backed distinctions above to decide what information still needs to be established before a form is completed.
A review sequence you can actually use
- Which exact application copy was transmitted?
- Are all intended pages legible and present?
- What does the retained transmission record actually show?
Write down the answer and the record that supports it, rather than marking a question complete because a field contains text. When two records disagree, identify whether the difference concerns the entity, an individual, the reporting period or the type of change. That makes the remaining question specific enough to resolve against the relevant instruction.
Keep the scope of a preparation service separate from the government requirement. A service intake question may gather information for a workflow; it does not create an exception, extend a deadline or determine whether a transaction is reportable. The cited government material remains the basis for those conclusions.
Questions to settle before moving forward
How should I check authorized signer?
The authorized SS-4 signer depends on the type of applicant. A foreign applicant may use a person with appropriate authorization to sign. [2, p.6]
How should I check field/section 4a: mailing address (room, apt., suite no. and street, or p.o. box)?
Enter the mailing address for IRS correspondence, including room, suite and other applicable address details. [3, p.1] [2, p.3]
How should I check field/section 4b: city, state, and zip code (if foreign, see instructions)?
For a foreign address, include the city, province or state, postal code and full country name. Do not abbreviate the country name. [3, p.1] [2, p.3]
How should I check field/section signature / date / name and title: signature date?
The appropriately authorized person for the applicant type signs, dates and identifies their name and title. Third-party designee authorization requires completion of the signature section. [3, p.1] [2, p.6]
Official sources and versions
- Employer identification number
- Instructions for Form SS-4 (Rev. December 2025) — Rev. December 2025
- Form SS-4 (Rev. December 2025) — Rev. December 2025
Get help with the relevant SpeedEIN workflow
SpeedEIN offers preparation and support for the situations described on its service pages. If you would like assistance, review the relevant service scope, supported entities and current availability before ordering. The service does not replace the government’s decision or remove an obligation imposed by the applicable rules.