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Form SS-4 — Application for Employer Identification Number
Form SS-4 is used to apply for an Employer Identification Number (EIN) — the tax ID number the IRS assigns to businesses, trusts, estates, and other entities, similar to a Social Security number for a business. Most applicants can also apply online at IRS.gov and receive an EIN immediately, but this form is required for entities that must apply by mail or fax. Fill it out directly in your browser and download the completed PDF. FileKit is not affiliated with the IRS, USCIS, or any government agency. This is the official current form, provided for your convenience — always verify you're using the latest version at the source link below before submitting.
How to fill out SS-4
- 1Enter the legal name of the entity and the reason you're applying (starting a new business, hiring employees, etc.).
- 2Provide the responsible party's name and SSN/ITIN, and describe the type of entity and its principal activity.
- 3Download the completed PDF, sign it, and mail or fax it to the IRS address for your state (see the form's instructions).
Frequently asked questions
Can I get an EIN faster than by mailing this form?
Yes — most US-based applicants can apply online directly at IRS.gov and receive an EIN immediately. Form SS-4 by mail or fax is mainly for applicants who can't use the online system, such as those without a US address.
Is there a fee to apply for an EIN?
No — the IRS does not charge a fee to obtain an EIN, whether you apply online or by this form.
How long does mail or fax processing take?
Fax applications are typically processed within about 4 business days; mailed applications can take several weeks.
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