What is the fax number for Form SS-4?

855-641-6935 if your business is in one of the 50 states or DC. Otherwise 855-215-1627 from inside the United States, or 304-707-9471 from outside it.

How long does an EIN take by fax?

The IRS says it generally faxes the EIN back within 4 business days. Online at IRS.gov/EIN it’s immediate; by mail, about 4 weeks.

Do I need a fax machine to get my EIN back?

No. You need a fax number that can receive faxes, which an online fax service can give you. Dimefax has one for a week for $5.99, with the fax delivered to your email.

Form SS-4 fax number: apply for an EIN by fax

Fax numbers

Business (or legal residence) in one of the 50 states or the District of Columbia 855-641-6935 Fax this number
No legal residence or principal place of business in a state or DC (for example, a U.S. territory or abroad), faxing from inside the United States 855-215-1627 Fax this number
Same, faxing from outside the United States 304-707-9471 Fax this number Not toll-free

Getting your EIN back by fax

The IRS faxes a cover sheet with your EIN to the fax number you write on Form SS-4, generally within 4 business days. (It no longer sends back the SS-4 itself with the EIN on it.) You need a number that can receive faxes for this. If you don’t have one, a Dimefax number for a week costs $5.99 once, and the IRS fax arrives in the app and in your email as a PDF.

How to fax it

Fill in Form SS-4 and sign it. The fillable PDF on irs.gov is fine for faxing.
Write your fax number on the form so the IRS can fax the EIN back.
If someone is applying for you, they complete and sign the Third Party Designee section.
Send it from dimefax.com/send to the number above for where your business is.
Watch for the IRS fax with your EIN, usually about 4 business days later.

Tips

The IRS gives out one EIN per responsible party per day, whichever way you apply.
These numbers are only for EIN applications. The IRS says they can change without notice.
The IRS no longer issues EINs by phone, except to international applicants (267-941-1099).

Dimefax costs 10¢ a page and you’re only charged if the fax goes through. On the web, page credits come in packs of 50 for $4.99, 100 for $9.99 or 200 for $19.99; the Dimefax iPhone app also sells 10 for $0.99. Credits you don’t use stay in your account and last as long as you fax once a year.

Where these numbers come from

Dimefax isn’t part of, or endorsed by, the IRS. We copied these numbers from irs.gov on November 11, 2026. Agencies change their numbers: if your letter, notice or form gives a different one, use that.

IRS Form SS-4 fax number (apply for an EIN)