IRS Form SS-4 Fax Number
Send Your EIN Application by Fax
Businesses in the 50 states or DC fax Form SS-4 to 855-641-6935. With no US legal residence or place of business, the number is different; see the routing table below. Put a return fax number on the form and your EIN comes back by fax after processing. Use your own fax number: FaxItOnce sends only and cannot receive the reply. Send for $2.75 flat.
Before You Send: Three Things That Decide How Your SS-4 Goes
Match the number to your location
Applicants in the 50 states or DC use one IRS fax line. Applicants with no legal residence or principal place of business in any state use a different line, and it changes again when sending from outside the United States. The routing table is below.
Put a return fax number on the form
If you include a fax number on your SS-4, the IRS faxes your EIN assignment letter back after processing. Use your own fax number; FaxItOnce sends only and cannot receive the reply. Leave it blank and the letter comes by mail.
Check every field first
A fax reaches the IRS as submitted and cannot be recalled. Save the completed form as a PDF and verify the current number on the IRS Where to File page for Form SS-4 before sending.
What Is IRS Form SS-4?
IRS Form SS-4 is the application for an Employer Identification Number (EIN). An EIN is a nine-digit number the IRS assigns to businesses, trusts, estates, and other entities for tax identification purposes. An EIN is often needed to open a business bank account, hire employees, file business tax returns, and apply for business licenses.
New Businesses
LLCs, corporations, partnerships, and sole proprietors who hire employees.
Trusts & Estates
Irrevocable trusts, estate administration, and fiduciary accounts.
Nonprofits
Tax-exempt organizations applying for 501(c)(3) status.
International Applicants
Foreign entities needing a US tax ID for US business activities.
IRS Fax Numbers for Form SS-4 by Location
Routing follows where your principal business, office or legal residence is, and for applicants with no US residence, where you are sending from. Please check the current fax numbers on the IRS website before sending.
| Your situation | IRS fax number |
|---|---|
| Principal business, office or legal residence in one of the 50 states or the District of Columbia | 855-641-6935 |
| No legal residence, principal place of business or principal office in any state, sending from inside the United States | 855-215-1627 |
| No legal residence, principal place of business or principal office in any state, sending from outside the United States | 304-707-9471 |
Before sending, visit the official IRS Where to File page for Form SS-4 to verify the current fax number and routing instructions. Fax numbers can change. Our IRS fax number directory shows the source page and the date each number was checked.
International Applicants, W-7 / ITIN and EIN by Fax
Foreign entities and non-US individuals without a Social Security Number can still obtain an EIN by fax or mail. The Form SS-4 instructions (line 7b) explain what to enter when the responsible party has no SSN or ITIN.
International SS-4 Fax Number
If you have no legal residence, principal place of business, or principal office in any state, the IRS routes your Form SS-4 to a different number than domestic applicants. Fax to 855-215-1627 from inside the United States, or 304-707-9471 from outside the United States. 855-641-6935 is for applicants located in one of the 50 states or the District of Columbia. Include a phone or fax number on the form where the IRS can reach you with your EIN.
Form W-7 (ITIN)
Individuals without an SSN who need a US taxpayer ID of their own apply for an ITIN using Form W-7. Check the W-7 instructions for how to file; it is not listed as a fax form. An ITIN, once issued, can be entered as the responsible party's number on Form SS-4.
Processing Time
A faxed SS-4 returns an EIN after processing when you provide a return fax number on the form (see the current IRS Form SS-4 instructions).
Common Use Cases
Foreign-owned single-member LLCs, non-resident e-commerce sellers, foreign trusts with US tax obligations, and international entities opening US bank accounts.
How Do I Fax Form SS-4 to the IRS?
Complete Form SS-4
Download from IRS.gov, fill out all fields, and save as a PDF.
Upload to FaxItOnce
Create a free account and upload your completed SS-4 PDF.
Enter Fax Number
Enter the IRS fax number for your location from the routing table above.
Pay & Send
Payment via Stripe checkout. You get a delivery email when the carrier confirms.
How Long Does It Take to Get an EIN by Fax?
Processing time varies. Check the IRS processing-status page for current estimates. If you include a return fax number on your form, the IRS faxes your EIN assignment letter back to you. Otherwise it comes by mail.
| Method | Processing Time | Cost |
|---|---|---|
| Online (IRS.gov) | Check eligibility on IRS.gov | Free |
| Fax (FaxItOnce) | Varies; check IRS status | $2.75 |
| Varies; check IRS status | Postage |
See the IRS processing-status page for current estimates. FaxItOnce sends only; it does not provide a return fax number.
How Much Does It Cost to Fax Form SS-4?
FaxItOnce
Flat rate
Up to 45 pages, see the table above
eFax
See current plans
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FedEx Office
$1.89 + $1.59/pg
Local, typical third-party reported price
Typical store prices as reported by third-party sources in 2026; stores do not publish official fax prices. Prices vary by location. Long-distance and international store rates are higher.
Frequently Asked Questions
What is the fax number for IRS Form SS-4?
It depends on where you are. Applicants in the 50 states or the District of Columbia use one IRS fax line; applicants with no legal residence or principal place of business in any state use a different line, which also differs for sending from inside or outside the United States. All three are in the routing table on this page. Verify the current number on the IRS Where to File page for Form SS-4 before sending.
How long does it take to get an EIN by fax?
Processing time varies. Check the IRS processing-status page for current estimates. If you include a return fax number on the form, the IRS faxes your EIN assignment letter back to you. Mail processing also varies.
Can I apply for an EIN by fax?
Yes. The IRS accepts Form SS-4 by fax. Applicants in the 50 states or the District of Columbia use one line; applicants with no legal residence or principal place of business in any state use a different line, which changes again for sending from outside the United States. If you cannot use the online application, the IRS also offers phone (for international applicants) and mail.
What do I need to fax Form SS-4?
A completed Form SS-4 saved as a PDF and the IRS fax number that matches your location. Check every field before sending, because a fax reaches the IRS as submitted and cannot be recalled.
Why would I fax Form SS-4 instead of applying online?
You cannot use the IRS online EIN application if your principal place of business is outside the US or the responsible party has no SSN or ITIN. The IRS then offers phone (for international applicants), fax or mail. Fax is generally faster than mail.
Will the IRS send my EIN back by fax?
Yes, if you include a fax number on your Form SS-4. The IRS faxes your EIN assignment letter back after processing. Without a return fax number, it comes by mail after processing.
Fax Form SS-4 to the IRS Without a Store Trip
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Davis Hill, founder, FaxItOnce (a GovBotics service).