Where to fax Form SS-4

The number

Where is the entity's legal residence, principal place of business, or principal office or agency?

• 855-641-6935

  Internal Revenue Service, Fax-TIN (one of the 50 states or the District of Columbia)

  Any of the 50 states or the District of Columbia.

• 855-215-1627

  Internal Revenue Service, Fax-TIN (no legal residence, principal place of business, or principal office or agency in any state or D.C.; faxing from within the United States)

  A U.S. territory, an APO or FPO address, or outside the United States — faxing from within the United States.

• 304-707-9471 (not toll-free; from outside the United States)

  Internal Revenue Service, Fax-TIN (faxing from outside the United States)

  Faxing from outside the United States.

From the Instructions for Form SS-4 (Rev. December 2025), “How To Apply for an EIN, Apply by fax”; the form itself is Rev. December 2019. Checked against the IRS's current copy on 2026-10-02. The IRS says these numbers may change without notice.

What the IRS says about faxing it

• Use only one method for each entity so you don't receive more than one EIN for an entity.
• Be sure to provide your fax number so the IRS can fax the EIN back to you.
• Fax-TIN numbers can only be used to apply for an EIN.

What happens next

Under the Fax-TIN program, you can receive your EIN by fax generally within 4 business days. Fax-TIN is available 24 hours a day, 7 days a week.

Before Send sends it, you will be asked

• Is this the only way you are sending it — not also by mail?
• Does the fax number you wrote on the form reach you? The IRS faxes the EIN to it.