What is an Employer Identification Number?

An Employer Identification Number (EIN), also known as a Federal Tax Identification Number, is a unique nine-digit identifier assigned by the Internal Revenue Service to business entities operating in the United States. Think of an EIN as your business’s Social Security Number – it serves as the official identifier for your company in all tax-related matters and numerous other business functions.

The name “Employer Identification Number” sometimes creates confusion, as many business owners assume it’s only necessary if they have employees. However, an EIN serves many purposes beyond employment taxes. It’s a fundamental business identifier used across various government agencies, financial institutions, and business relationships.

EINs are formatted as XX-XXXXXXX, with the first two digits typically representing the IRS campus that issued the number. Unlike Social Security Numbers, EINs aren’t considered sensitive personal information, making them safer to use on forms, applications, and business documents where an identification number is required.

Who Needs an Employer Identification Number?

While not every business requires an EIN, many business activities and structures make having one either mandatory or highly beneficial:

Mandatory EIN Requirements

You must obtain an EIN if your business:

• Has employees (including yourself if you’ve formed a corporation)
• Operates as a corporation or partnership
• Files employment, excise, alcohol, tobacco, or firearms tax returns
• Withholds taxes on income paid to non-resident aliens
• Has a Keogh plan (tax-deferred pension plan)
• Is involved with certain organizations (trusts, estates, non-profits, farmers’ cooperatives)
• Files for bankruptcy under Chapter 7 or 11

Highly Beneficial Uses

Even when not strictly required, an EIN provides significant advantages for:

• Sole proprietors seeking to separate personal and business finances
• Independent contractors working with multiple clients
• Business owners planning future growth or employee hiring
• Entrepreneurs establishing business credit separate from personal credit
• Anyone concerned about identity theft when conducting business

The Many Uses of an EIN

An EIN serves multiple purposes throughout your business’s lifecycle:

Banking and Financial Management

• Opening business bank accounts (required by most financial institutions)
• Applying for business credit cards and loans
• Establishing merchant accounts for payment processing
• Setting up business investment accounts

Tax Compliance and Reporting

• Filing business tax returns
• Processing payroll and employment taxes
• Reporting contractor payments (1099 forms)
• Managing state and local tax obligations

Business Operations

• Applying for business licenses and permits
• Establishing vendor and supplier relationships
• Contracting with government agencies
• Filing for trademark or patent protection

Identity Protection

• Reducing exposure of your Social Security Number
• Creating separation between personal and business activities
• Limiting personal information on business documents
• Protecting against business identity theft

Types of EINs and Special Considerations

While all EINs share the same format, certain business situations involve special considerations:

Nonprofit Organizations

Nonprofit entities need an EIN before applying for tax-exempt status (501(c)(3) or other designations). The EIN application should indicate nonprofit status to ensure proper classification.

Foreign Entities

Non-U.S. companies doing business in the United States can obtain an EIN by providing additional documentation, including the country of incorporation and proof of legal formation.

Trusts and Estates

Certain trusts and all estates require EINs for tax purposes, with specific application requirements based on the type of trust or estate administration.

Multiple Businesses

If you own multiple businesses, each separate legal entity requires its own EIN, even if they operate in related industries or share ownership.

Changing Business Structure

When you change your business structure (e.g., from sole proprietorship to LLC), you typically need a new EIN to reflect the change in entity type.

The EIN Application Process

Obtaining an EIN involves several important steps:

1. Timing Considerations

• Apply after your business is legally formed
• Ensure responsible party information is current and accurate
• Consider business needs and banking requirements

2. Required Information

• Legal name of the business entity
• Responsible party’s name and Social Security Number
• Type of legal structure (sole proprietorship, LLC, corporation, etc.)
• Reason for applying
• Principal business activity
• Number of employees expected in the next 12 months
• Physical business address and mailing address

3. Application Methods

• Online: The fastest method, providing immediate issuance (limited to U.S.-based applicants)
• Fax: Processed within four business days
• Mail: Typically processed within four weeks
• Phone: Available for international applicants

4. After Approval

• Retain your EIN confirmation letter (CP 575) in secure business records
• Provide your EIN to banks, vendors, and relevant government agencies
• Include your EIN on all federal tax filings and employment documents
• Update your EIN information if business details change

Common EIN Questions and Scenarios

Can I use my EIN immediately?

Yes, once issued, your EIN is active and can be used immediately for most business purposes, including opening bank accounts and applying for business licenses.

What if I lose my EIN?

If you misplace your EIN, you can:

• Check previous tax returns or business documents
• Contact the bank where you opened your business account
• Call the IRS Business & Specialty Tax Line at 800-829-4933
• Review any correspondence from the IRS

Can I change my EIN if my business structure changes?

In most cases, when your business structure changes (e.g., sole proprietorship to LLC, or LLC to corporation), you’ll need a new EIN. However, certain minor changes like name changes for the same entity type typically don’t require a new EIN.

Do I need a new EIN if I purchase an existing business?

Generally, yes. When you purchase a business, you should obtain a new EIN rather than continuing to use the previous owner’s number, especially if the entity structure changes with the purchase.

Can I cancel or close an EIN?

EINs are never reused or canceled. If you close your business, you should close your business account with the IRS by sending a letter explaining the situation, but the EIN itself remains permanently assigned to your entity.

EIN Compliance and Best Practices

Maintaining proper EIN compliance involves several important practices:

Keep Your EIN Secure

While not as sensitive as a Social Security Number, your EIN should still be protected:

• Provide it only to legitimate business contacts and financial institutions
• Be cautious of email or phone requests for your EIN
• Verify the legitimacy of any form requiring your EIN

Update EIN Information When Changes Occur

Notify the IRS if significant business changes occur:

• Business name changes
• Address changes
• Responsible party changes
• Business activity changes

Maintain Clear Records

Document all places where your EIN is used:

• Financial institutions
• State and local tax authorities
• Vendor and client accounts
• Government registrations and licenses

Use Your EIN Consistently

Ensure all tax filings and business documents use the same EIN to avoid compliance issues and potential tax notices.