What Is the Purpose of a US Federal Tax ID (EIN)?« Back to Previous Page

A US federal tax ID EIN (Employer Identification Number) is a nine-digit number issued by the Internal Revenue Service (IRS) to identify businesses and other entities for federal tax purposes.

Although the name includes the word “Employer,” an EIN is not only for companies with employees. Many businesses need an EIN even if they have no workers, including LLCs, corporations, partnerships, and foreign-owned US companies.

An EIN works like a tax identification number for a business. It allows the IRS, banks, payment processors, and other organizations to identify the company separately from its owners.

Main Uses of a US Federal Tax ID EIN

1. Filing Business Taxes

The primary purpose of an EIN is to identify a business when handling tax matters with the IRS.

Companies may use an EIN for:

• Federal income tax returns
• Partnership tax filings
• Payroll tax reporting
• Excise tax filings
• Information returns

The EIN connects the company’s tax records with the IRS.

2. Opening a US Business Bank Account

Most banks require a US federal tax ID EIN before opening a business account.

When applying for a business bank account, banks commonly request:

• EIN confirmation letter
• Company formation documents
• Ownership information
• Identification documents

An EIN helps banks verify that the account belongs to a legitimate business entity.

3. Hiring Employees and Processing Payroll

If a company hires employees in the United States, it generally needs an EIN to handle payroll responsibilities.

Employers use the EIN for:

• Reporting employee wages
• Filing payroll tax returns
• Paying employment taxes
• Issuing tax forms such as W-2

Without an EIN, businesses generally cannot properly manage employee tax obligations.

4. Applying for Payment Platforms and Business Services

Many companies require an EIN when applying for business services, including:

• Payment processors
• Merchant accounts
• Business credit cards
• Vendor accounts
• Online marketplaces

For example, platforms such as Stripe, PayPal, and Amazon may request business information, including an EIN, as part of their verification process.

5. Separating Business and Personal Finances

An EIN helps create a clear separation between the company and its owners.

Using an EIN allows businesses to:

• Open accounts under the company name
• Receive payments as a business entity
• Maintain proper accounting records
• Avoid mixing personal and business transactions

This is especially important for LLC owners who want to maintain proper company records.

Do Foreigners Need an EIN for a US Company?

Yes, many foreign-owned US companies need an EIN.

A non-US resident can generally form a US LLC or corporation without:

• US citizenship
• US residency
• Social Security Number (SSN)

Foreign owners without an SSN may still apply for an EIN through IRS procedures.

Common situations where foreign entrepreneurs need an EIN include:

• Opening a US business bank account
• Operating a US LLC
• Applying for payment services
• Filing required tax forms
• Working with US suppliers

Is an EIN the Same as an SSN?

No.

Although both are nine-digit identification numbers, they serve different purposes.

A company owner may have an SSN or ITIN personally while the company has its own EIN.

Does an EIN Expire?

Generally, an EIN does not expire.

Once issued, an EIN remains associated with the business entity. However, a company may need to apply for a new EIN in certain situations, such as major changes in ownership or business structure.

Simply changing a business address or adding a trade name usually does not require a new EIN.

How to Apply for an EIN?

Businesses can apply for an EIN through the IRS.

Common application methods include:

• Online application (for eligible applicants)
• Fax
• Mail
• Phone for international applicants

The information required usually includes:

• Legal company name
• Company address
• Entity type
• Responsible party information
• Reason for applying

The IRS does not charge a government fee for issuing an EIN.

Conclusion

A US federal tax ID EIN is one of the most important documents for operating a US company. It is used for tax reporting, banking, payroll, payment platforms, and many other business activities.

For both US residents and international entrepreneurs, obtaining an EIN is usually an essential step after forming a US LLC or corporation. While registering a company creates the legal entity, an EIN allows that entity to operate properly within the US financial and tax system.