Fax to Government & tax
How to Fax to IRS — Form SS-4 (Apply for EIN): Step-by-Step Guide
Government & tax
IRS — Form SS-4 (Apply for EIN)
Washington, DC
Verified Mar 2026
Fax number
(855) 641-6935
What to include
- ✓Signed Form SS-4
- ✓Legal business name and address
- ✓Reason for applying and entity type
- ✓Cover letter with contact email and phone
Quick info
Department: IRS EIN International / Fax Applications
Fax line: (855) 641-6935
- Complete every field on Form SS-4 — incomplete forms are rejected
- Include responsible party name and SSN/ITIN as required
- Keep the fax confirmation and RonFax status receipt
This line is commonly cited for international SS-4 fax filings. U.S. domestic applicants should follow current IRS SS-4 instructions.
Prerequisites — what to prepare
Before you fax IRS — Form SS-4 (Apply for EIN), gather these items into one PDF when possible:
- ✓Signed Form SS-4
- ✓Legal business name and address
- ✓Reason for applying and entity type
- ✓Cover letter with contact email and phone
Step-by-step — send via RonFax
No fax machine required. Pay once from $1.99 for up to 3 pages ($0.50 per extra page).
- Prepare Form SS-4 PDF per IRS instructions.
- Confirm fax eligibility and destination number on irs.gov.
- Send through RonFax — pay once, track transmission.
Send your fax
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