IRS Form SS-4 Fax Number
Apply for EIN by Fax in 4 Business Days
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 in about 4 business days instead of about 4 weeks by mail. 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 in about 4 business days. Leave it blank and the letter comes by mail, which takes about 4 weeks.
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. You need an EIN 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.
| 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 |
Verify the current fax number on the IRS Where to File page for Form SS-4 before sending. Fax numbers may change without notice. 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, but the process differs from domestic applicants. International applicants who lack an SSN typically must first apply for an ITIN using Form W-7, then submit Form SS-4 for the EIN.
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 tax ID apply for an ITIN using Form W-7. W-7 is mailed (not faxed) with supporting identity documents to the IRS ITIN Operation in Austin, TX. Once issued, the ITIN can be used as the "Responsible Party" identifier on Form SS-4.
Processing Time
International SS-4 fax submissions are processed by the IRS in approximately 4 business days. The IRS will fax the EIN confirmation back to a US fax number you provide on the form.
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 $2.75 & Send
Secure payment via Stripe. Your fax is sent immediately.
How Long Does It Take to Get an EIN by Fax?
When you fax Form SS-4, the IRS typically assigns your EIN within 4 business days. If you include a return fax number on your form, the IRS will fax your EIN assignment letter back to you. Otherwise, they mail it, which takes about 4 weeks.
| Method | Processing Time | Cost |
|---|---|---|
| Online (IRS.gov) | Immediate | Free |
| Fax (FaxItOnce) | 4 business days | $2.75 |
| 4 weeks | Postage |
Faxing is the best option when the online application is unavailable or does not support your entity type.
How Much Does It Cost to Fax Form SS-4?
FaxItOnce
$2.75 flat
Up to 45 pages
eFax
$16.95/mo
Monthly subscription
UPS / FedEx
$1-$2.50/pg
Plus drive time
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 above. Always verify at IRS.gov before sending.
How long does it take to get an EIN by fax?
The IRS typically processes faxed EIN applications within 4 business days. If you include a return fax number on the form, the IRS will fax your EIN assignment letter back to you.
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. See the routing table above. Faxing is the usual route when you cannot use the online application.
What do I need to fax Form SS-4?
You need a completed Form SS-4 saved as a PDF, the IRS fax number that matches your location, and $2.75 to send with FaxItOnce. 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?
Some applicants cannot use the IRS online EIN application, including international applicants without a US address, estates, certain trusts, and entities with foreign responsible parties. Faxing is the fastest alternative.
Will the IRS send my EIN back by fax?
Yes, if you include a fax number on your Form SS-4. The IRS will fax your EIN assignment letter within 4 business days. Without a return fax number, they mail it (about 4 weeks).
How much does it cost to fax Form SS-4 to the IRS?
FaxItOnce charges a flat $2.75 to fax Form SS-4, up to 45 pages. No per-page fees, no monthly subscription. Compare that to $16.99/month for eFax or $5+ at a retail store.
Get Your EIN in 4 Days, Not 4 Weeks
Fax Form SS-4 to the IRS for $2.75. Skip the 4-week mail wait. No subscription required.
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