Internal Revenue Service · Federal form
Fill out Form SS-4
Application for Employer Identification Number Rev. December 2025
From IRS: Use Form SS-4 to apply for an employer identification number (EIN), a 9-digit number assigned to employers, sole proprietors, corporations, partnerships, estates, trusts, certain individuals and other entities for tax filing and reporting purposes. Source
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One application method. Use only one method for each entity so you do not receive more than one EIN for an entity. Source
Facts from the official source
Quoted or closely restated from the IRS's own pages and PDFs, checked .
| Fact | What the source says | Source |
|---|---|---|
| Issued by | Internal Revenue Service, U.S. Department of the Treasury | About Form SS-4 (IRS) |
| Edition | Rev. December 2025 | Form SS-4 (Rev. December 2025), official PDF Form SS-4, page 1 footer; header reads "(Rev. December 2025)". |
| Current revision | The IRS links the Rev. December 2025 PDF (fss4.pdf) as the current revision. | About Form SS-4 (IRS) About Form SS-4, "Current revision" section. |
| How to apply | Online (only for applicants in the United States or U.S. territories), by telephone (only for applicants outside the United States or U.S. territories), by fax, or by mail. | Instructions for Form SS-4 (Rev. December 2025), PDF Instructions for Form SS-4 (Rev. December 2025), page 1, "How To Apply for an EIN". |
| Mail (50 states and DC) | Internal Revenue Service, Attn: EIN Operation, Cincinnati, OH 45999. | Instructions for Form SS-4 (Rev. December 2025), PDF Instructions for Form SS-4 (Rev. December 2025), page 2, "Apply by mail". |
| Mail (outside the 50 states and DC) | Internal Revenue Service, Attn: EIN International Operation, Cincinnati, OH 45999. | Instructions for Form SS-4 (Rev. December 2025), PDF Instructions for Form SS-4 (Rev. December 2025), page 2, "Apply by mail". |
| Fax (50 states and DC) | Fax the form to 855-641-6935 (Fax-TIN program). | Instructions for Form SS-4 (Rev. December 2025), PDF Instructions for Form SS-4 (Rev. December 2025), page 2, "Apply by fax". |
| Fax (outside the 50 states and DC) | Fax the form to 855-215-1627 from within the United States, or 304-707-9471 from outside the United States. | Instructions for Form SS-4 (Rev. December 2025), PDF Instructions for Form SS-4 (Rev. December 2025), page 2, "Apply by fax". |
| Cost (online application) | Applicants in the United States or U.S. territories can apply for and receive an EIN free of charge on IRS.gov. | Instructions for Form SS-4 (Rev. December 2025), PDF Instructions for Form SS-4 (Rev. December 2025), page 1, Reminders, "Apply for an EIN online". |
| Signature (mail) | Sign and date the application and mail it to the appropriate address. | Instructions for Form SS-4 (Rev. December 2025), PDF Instructions for Form SS-4 (Rev. December 2025), page 2, "Apply by mail". |
| Who signs | When required, the application is signed by the individual; for a corporation, the president, vice president or other principal officer; for a partnership, government entity or other unincorporated organization, a responsible and duly authorized member or officer; for a trust or estate, the fiduciary. | Instructions for Form SS-4 (Rev. December 2025), PDF Instructions for Form SS-4 (Rev. December 2025), page 6, "Signature". |
| One application method | Use only one method for each entity so you do not receive more than one EIN for an entity. | Instructions for Form SS-4 (Rev. December 2025), PDF Instructions for Form SS-4 (Rev. December 2025), page 1, "How To Apply for an EIN". |
| Daily limit | EIN issuances are limited to one per responsible party, per day, for online, telephone, fax and mail requests. | Instructions for Form SS-4 (Rev. December 2025), PDF Instructions for Form SS-4 (Rev. December 2025), page 1, Caution. |
| Official instructions | Instructions for Form SS-4 (Rev. December 2025). | About Form SS-4 (IRS) About Form SS-4, "Current revision" section. |
| Keeping the information current | Use Form 8822-B to report changes to your responsible party, address or location. Changes in responsible parties must be reported to the IRS within 60 days. | About Form SS-4 (IRS) About Form SS-4, "Note" below the opening paragraph. |
What is on the form
- Lines 1 to 7b
- Legal name, trade name, executor/trustee/“care of” name, mailing and street addresses, county and state of the principal business, and the responsible party’s name and SSN, ITIN or EIN. Form SS-4, page 1
- Lines 8a to 9b
- Whether the applicant is an LLC (number of members, organized in the United States), type of entity, and state or foreign country of incorporation. Form SS-4, page 1
- Lines 10 to 12
- Reason for applying, date the business started or was acquired, and closing month of the accounting year. Form SS-4, page 1
- Lines 13 to 18
- Expected employees, Form 944 election, first date wages were paid, principal activity, principal line of merchandise or services, and any previous EIN. Form SS-4, page 1
- Third Party Designee
- Designee’s name, address, telephone and fax numbers (only if you want to authorize a designee). Form SS-4, page 1
- Signature
- Name and title, signature, date, and applicant’s telephone and fax numbers. Form SS-4, page 1
Checked by PDF Tower: the official PDF has 2 pages and 89 fillable fields (45 text, 44 checkbox or radio), 120 KB. SHA-256 23d295529950b059…, computed .
Edition and revisions
- Edition on this page: Rev. December 2025.
- Recent developments (IRS): Reinstatement of Form SS-4’s line 14 election to file Form 944 annually (28-MAR-2024); Certain forms, instructions, and publications used by taxpayers in Puerto Rico have been replaced (14-MAR-2024). Source
- All revisions at IRS
Sources
- About Form SS-4 (IRS) Retrieved .
- Form SS-4 (Rev. December 2025), official PDF Retrieved .
- Instructions for Form SS-4 (Rev. December 2025), PDF Retrieved .
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