Legal Form of Your Entity – Fillable SS‑4 PDF

When you start a business, the legal form of your entity (sole proprietorship, partnership, corporation, LLC, etc.) determines tax obligations, liability protection, and filing requirements. The IRS Form SS‑4 is the official application for an Employer Identification Number (EIN) and includes a crucial section where you declare your entity’s legal structure.

What Is the Legal Form of Your Entity?

The legal form describes how your business is organized under state law. Common classifications are:

• Sole Proprietorship
• Partnership (general or limited)
• Corporation (C‑corp or S‑corp)
• Limited Liability Company (LLC)
• Non‑profit organization

Choosing the correct legal form on the SS‑4 ensures the IRS processes your EIN correctly and assigns the appropriate tax treatment.

How to Fill Out the SS‑4 Form Online

Instead of downloading the PDF and editing it with a separate editor, simply click the "Fill out this form" button below. The Formize PDF Filler app will load in your browser, letting you complete the form instantly.

1. Click Fill out this form.
2. The Formize PDF Filler loads – no installation required.
3. Enter your business information, paying special attention to Line 9 – Type of Entity.
4. Save the completed PDF or submit directly to the IRS as instructed.

Common Mistakes to Avoid

• Leaving Line 9 blank – the IRS cannot assign an EIN without a clear entity type.
• Choosing the wrong entity code (e.g., selecting "Corporation" for an LLC).
• Using an outdated address or phone number, which can delay processing.
• Submitting the form with illegible handwriting – the online filler eliminates this risk.

Where to Submit the Completed Form

After you finish the fillable SS‑4, you can:

• Mail it to the IRS address listed in the instructions.
• Fax it using the numbers provided for expedited processing.
• Apply online through the IRS website (the same EIN can be obtained without the PDF).

FAQs About the SS‑4 Legal Entity Section

Below are the most common questions users ask when completing the legal form portion of the SS‑4.