What is the process for faxing a completed SS-4 form to the IRS?

Complete the form accurately, find the correct fax number for your location (e.g., 855-641-6935 for US residents), and send it using a fax machine or online fax service like mFax.to.

Where can I find the IRS fax number for submitting an SS-4 form?

For US residents: 855-641-6935. For international applicants: 304-707-9471. Check the article for more specific numbers.

Can I receive a confirmation letter from the IRS after faxing my SS-4 form?

Yes, if you provide a fax number on your application, the IRS will fax back your EIN confirmation, typically within 4 business days.

What if I don't have a fax number to receive my EIN?

If you don't have a physical fax machine, you can use an online fax service like mFax.to to get a temporary or permanent virtual fax number. This allows you to receive the IRS confirmation letter directly to your email as a PDF.

Can I designate a third party to receive the EIN?

Yes. You can complete the 'Third Party Designee' section on the form to allow an accountant, attorney, or friend to receive the EIN on your behalf. They must also sign the form.

Is faxing safer than mailing?

Generally, yes. Faxing eliminates the risk of mail getting lost in transit. Plus, online fax services provide encryption and delivery confirmation, so you know exactly when the IRS received your document.

Can I file online instead?

Yes, the IRS Online EIN Assistant is the fastest method (instant EIN). However, it is often unavailable for international applicants or complex entity types. In those cases, faxing is the best backup.

How to Fax Form SS-4 to IRS: A 2026 Guide for EIN Application Submission

Learn how to fax Form SS-4 to the IRS for a hassle-free EIN application process. Simplify your paperwork today.