---
title: IRS Form SS-4 – Application for Employer Identification Number (EIN)
description: Learn how to use IRS Form SS-4 to apply for an EIN. Understand who needs an EIN, its purpose, and why it is essential for U.S. tax compliance.
---

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# IRS Form SS-4 – Application for Employer Identification Number (EIN)

### What is Form SS-4?

Form SS-4 is used to apply for an **Employer Identification Number (EIN)**, which is required for businesses to file taxes, open bank accounts, and hire employees.

### Who needs an EIN?

- Corporations, partnerships, and LLCs.
- Sole proprietors hiring employees.
- Foreign-owned entities required to file with the IRS.

### Key points

- The EIN acts like a business’s Social Security Number.
- It is necessary for filing forms such as 5472, 1065, and 1120.

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