How long does it take to get an EIN by fax?

Under the IRS Fax-TIN program, you generally receive your EIN back by fax within about 4 business days — much faster than the roughly 4 weeks it takes by mail. Be sure to include your own return fax number on the form so the IRS can fax your EIN back to you.

Form SS-4 IRS Fax Number & How to Fax It

Q: Where do I fax Form SS-4?

Fax Form SS-4 to 855-641-6935 if your legal residence, principal place of business, or principal office is in one of the 50 states or the District of Columbia. If you have no U.S. business location (U.S. territory or international applicants), fax it to 855-215-1627 from within the United States, or 304-707-9471 (not toll-free) from outside the United States. Verify the current numbers in the official IRS Form SS-4 instructions before sending.

Form SS-4 is the application for an Employer Identification Number (EIN) — needed to open a business bank account, hire employees, or file certain business tax forms. While many applicants use the IRS's online EIN tool, faxing is still the standard method for entities that aren't eligible to apply online, including many international applicants.

💡 Under the IRS's Fax-TIN program, applicants who fax Form SS-4 typically receive their EIN back by fax within about 4 business days — much faster than mailing.

Where Do I Fax Form SS-4? (IRS Fax-TIN Numbers)

The correct number depends on whether your business has a location in the United States:

855-641-6935

50 States & Washington, DC

Use this number if your legal residence, principal place of business, or principal office is in any of the 50 states or the District of Columbia.

855-215-1627 (from within the U.S.)

304-707-9471 (from outside the U.S.)

No U.S. Business Location

For U.S. territory and international applicants with no legal residence, principal place of business, or principal office in any state or DC. The 304 number is not toll-free.

Numbers verified against the official IRS Form SS-4 instructions (Dec. 2025 revision) in July 2026. IRS fax numbers can change — double-check the current instructions at irs.gov before sending.

Before You Fax

Include your own return fax number on the form. The IRS sends your EIN back by fax, so if this is missing, you won't receive a response that way.
The correct submission fax number depends on where the applicant's principal place of business, office, or agency is located — domestic, U.S. territory, or entirely outside the U.S. all route differently.
Use only one method to apply for your EIN (fax, mail, or online) — applying multiple ways can result in duplicate EINs being issued.

⚠️ SS-4 fax numbers vary by applicant location and can change. Always confirm the current number on the official Form SS-4 instructions at irs.gov before sending.

How to Send It Online

Download Form SS-4 from irs.gov and complete it, including a return fax number where you can receive your EIN
Find the right submission number in the boxes above for your location, and confirm it against the current official instructions
Save your completed form as a clean PDF
Upload it right here on LowFax using the Send a Fax button below, enter the verified fax number, and send
Keep your delivery confirmation, and watch for your EIN to arrive by fax within a few business days

Who Typically Uses Fax Instead of the Online Tool

The IRS's online EIN application isn't available to every applicant — for example, entities without a U.S. principal location generally can't use it and need to apply by fax or mail instead. Fax remains significantly faster than mail in these cases.

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How to Fax Form SS-4 (EIN Application) to the IRS

Where Do I Fax Form SS-4? (IRS Fax-TIN Numbers)

Before You Fax

How to Send It Online

Who Typically Uses Fax Instead of the Online Tool

Ready to Fax Your Form SS-4?

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