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Fill Out Form SS-4 Online (EIN Application, Free)
Form SS-4 is the application for an Employer Identification Number (EIN). Fill it in below, sign, and fax or mail it to the IRS, or use the details to apply online.
Have your own copy?
The PDF opens in this browser tab. What you type and your signature never leave your device.
What is Form SS-4?
Businesses, trusts, estates and some individuals need an EIN. Many people can apply online at irs.gov, but international applicants and some entity types must fax or mail the SS-4.
Filling it in: quick tips
- Line 1: the legal name of the business or entity.
- Lines 7a–7b: the responsible party and their SSN, ITIN or EIN.
- Line 9a: the entity type; line 10: the reason for applying.
- Sign at the bottom and include a phone and fax number if you'd like the EIN faxed back.
These tips are a quick guide, not tax advice. The form's own instructions on irs.gov are the final word. Form version: Rev. December 2025, checked October 2026.
How to fill in Form SS-4
Open
The official Form SS-4 (Rev. December 2025) opens right here. Or add your own copy.
Fill & sign
Type into the highlighted boxes and tick the right options. Use Signature and Date to sign.
Download
Download your completed PDF and send it to whoever asked for it.
Frequently asked questions
Can I fax Form SS-4?
Yes. The IRS lists fax numbers in the SS-4 instructions, and can fax your EIN back if you include your fax number. No fax machine? You can fax a PDF from your phone with a fax app.
Is there a fee for an EIN?
No. The IRS never charges for an EIN. Be careful of sites that charge to file the SS-4 for you.
Is my information uploaded?
No. The PDF opens in this browser tab and everything you type stays on your device. Nothing is sent to a server, so your SSN, address and signature never leave your computer or phone.
Is it really free?
Yes. No trial, no subscription, no sign-up and no watermark. You download the finished PDF straight away. (Some “free” PDF fillers charge a small trial fee that turns into a monthly subscription. This one never asks for a card.)
Can I sign it here?
Yes. Press Signature to draw it with your mouse or finger, type your name in a handwriting style, or upload a photo of your signature, then place it on the signature line.