Fax Form SS-4 to the IRS
Get Your EIN in 4 Business Days
Fax to 855-641-6935 for $2.75. EIN in 4 business days instead of 4 weeks by mail.
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.
What Is the Fax Number for Form SS-4?
IRS Form SS-4 Fax Number
855-641-6935
This is the IRS fax number for all Form SS-4 EIN applications regardless of your state.
Verify the current fax number at IRS.gov before sending. Fax numbers may change without notice.
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 855-641-6935 as the recipient fax number.
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
$16.99/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?
The IRS fax number for Form SS-4 (EIN application) is 855-641-6935. This number is the same for all states. 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 at 855-641-6935. This is the best option if you cannot apply online — for example, international applicants or certain entity types not supported by the online system.
What do I need to fax Form SS-4?
You need a completed Form SS-4 saved as a PDF, the IRS fax number (855-641-6935), and $2.75 to send with FaxItOnce. Make sure all required fields are filled in before faxing.
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.
No credit card required until you are ready to send