If you’re starting a business, hiring employees, or forming a corporation in the United States, you’ve likely encountered the term “FEIN” or “EIN.” Understanding what a Federal Employer Identification Number (FEIN) is and how to use it properly is essential for compliance with the Internal Revenue Service and for establishing your business’s legal identity. This comprehensive guide will walk you through everything you need to know about FEIN definitions, applications, and proper usage.
What is a FEIN?
A Federal Employer Identification Number (FEIN), formally known as an Employer Identification Number (EIN), is a unique nine-digit identification number assigned by the Internal Revenue Service (IRS) to businesses operating in the United States. The IRS uses this number to track business entities for tax purposes, making it analogous to a Social Security number for businesses.
A FEIN is a nine-digit number formatted as XX-XXXXXXX that identifies a specific business entity for federal tax purposes. It is issued by the IRS and remains associated with the business throughout its existence, even if the business changes names, locations, or ownership structures. The IRS officially refers to this identification number as an Employer Identification Number (EIN), though “FEIN” and “Federal EIN” are commonly used alternative terms in business contexts.
The distinction between “FEIN” and “EIN” is primarily semantic. The IRS uses “Employer Identification Number” in official documentation, while “Federal Employer Identification Number” emerged from early tax regulations that used the word “Federal” to distinguish it from state-level identification numbers. Both terms refer to the same nine-digit number issued by the IRS.
Primary characteristics of a FEIN include:
- Nine-digit format assigned by the IRS
- Valid for the life of the business entity
- Required for federal tax filing and reporting
- Can be obtained online, by mail, fax, or phone
- Free to apply for through the IRS
How to Obtain a FEIN
Obtaining a FEIN is a straightforward process that the IRS has streamlined significantly over the years. Businesses can apply for their FEIN through several methods, with online application being the fastest and most convenient option for most applicants.
The IRS provides the FEIN application process through their website at no cost. To apply online, visit the IRS website and complete the SS-4 form electronically. The online application is available Monday through Friday, 7:00 AM to 10:00 PM Eastern Time. Most online applications result in immediate FEIN issuance upon completion of the application and verification of information.
For those preferring alternative methods, businesses can apply by phone, fax, or mail. The phone application requires calling the IRS Business and Specialty Tax Line at 1-800-829-4933. This service is available Monday through Friday, 7:00 AM to 7:00 PM in the business’s local time zone. Fax applications require completing Form SS-4 and faxing it to the appropriate IRS office based on the business’s location. Mail applications follow a similar process but take significantly longer to process, typically four to six weeks.
To apply for a FEIN, you will need to provide:
- Legal name of the business entity
- Trade name or “doing business as” name (if applicable)
- Type of business entity (corporation, partnership, LLC, sole proprietorship)
- Date the business was started or incorporated
- Number of employees expected in the current tax year
- Principal business activity and industry code
- Responsible party name and Social Security Number or individual taxpayer identification number
The “responsible party” is the individual who ultimately controls or manages the entity. For most small businesses, this is the owner or principal officer. The IRS requires this information to verify the application and ensure proper accountability.
What is a FEIN Used For?
A FEIN serves multiple critical functions for business operations. Understanding these uses helps business owners understand why obtaining this identification number is so important for virtually any business activity beyond basic sole proprietorship without employees.
Primary uses of a FEIN include:
Federal Tax Compliance: The FEIN is essential for filing federal tax returns, including income tax, employment tax, and excise tax returns. Businesses use their FEIN when preparing and submitting quarterly and annual tax documents to the IRS.
Employee Management: Any business with employees must have a FEIN to report wages, withhold taxes, and comply with employment tax requirements. The FEIN appears on all W-2 forms, 1099 forms, and other employment-related tax documents.
Banking and Finance: Banks and financial institutions require a FEIN to open business bank accounts, apply for business loans, and establish credit lines. Your FEIN serves as primary identification for all business financial activities.
Business-to-Business Transactions: Many vendors and contractors require a FEIN to process payments, file 1099 forms, and maintain proper records for tax purposes. If you pay independent contractors more than $600 annually, you’ll need their FEIN (or their individual SSN if they haven’t obtained one).
State and Local Requirements: Most states require a FEIN to register for state taxes, obtain business licenses, and comply with state employment requirements. Your FEIN often serves as the bridge between federal and state business identification.
Professional Licensing: Certain professional licenses and permits require proof of FEIN issuance as part of the application process, particularly for regulated industries like healthcare, financial services, and construction.
FEIN vs. Other Business Identifiers
Understanding the differences between a FEIN and other business identification numbers helps clarify when and how to use each identifier appropriately.
FEIN vs. Social Security Number (SSN): A FEIN identifies a business entity, while an SSN identifies an individual person. Sole proprietors without employees can use their personal SSN for business tax purposes, but obtaining a FEIN still provides significant benefits including enhanced privacy (your personal SSN won’t appear on business documents) and professional credibility. Once a business hires employees or incorporates, a FEIN becomes mandatory.
FEIN vs. State EIN: Some states issue their own employer identification numbers for state tax purposes. While these may resemble FEINs in format, they serve state-level tax administration and are distinct from the federal FEIN issued by the IRS. Your FEIN typically suffices for both federal and state purposes, though some states may require separate registration using your FEIN.
FEIN vs. DUNS Number: A D-U-N-S number is a unique nine-digit identifier issued by Dun & Bradstreet for business credit reporting purposes. Unlike a FEIN, which is required by law for tax purposes, a D-U-N-S number is voluntary and primarily used for business credit evaluation and B2B relationships. The two identifiers serve different purposes and are not interchangeable.
FEIN vs. EIN: As discussed earlier, FEIN and EIN are the same thing. “FEIN” stands for Federal Employer Identification Number, while “EIN” is the official IRS terminology. Using either term is acceptable, though EIN appears more frequently in official IRS communications and forms.
When Do You Need a FEIN?
Certain business activities legally require obtaining a FEIN, while others may make having one advantageous but not mandatory. Understanding these requirements helps business owners ensure compliance while avoiding unnecessary administrative burden.
Circumstances requiring a FEIN:
- Hiring employees (including family members)
- Operating as a corporation or partnership
- Filing federal tax returns (excise, employment, or income tax)
- Withholding federal taxes from employee wages
- Operating as a sole proprietor with a Keogh plan
- Establishing a pension or retirement plan
- Applying for tax-exempt status (501(c) organizations)
Circumstances where a FEIN is beneficial but optional:
- Opening a business bank account
- Building business credit history
- Applying for business licenses
- Establishing vendor accounts
- Creating a more professional business image
- Separating personal and business finances
Sole proprietors without employees who do not file excise or employment tax returns can technically operate without a FEIN using their personal SSN. However, virtually all business experts recommend obtaining a FEIN regardless of legal requirements to protect personal identity and establish proper business infrastructure.
How to Use Your FEIN Properly
Once you obtain your FEIN, proper usage ensures compliance with IRS regulations and protects your business identity. Knowing where and how to use your FEIN is just as important as obtaining it.
Common scenarios for FEIN usage:
On tax forms: Your FEIN appears on all federal tax documents, including Forms 941 (quarterly employment tax), 940 (annual FUTA tax), W-2 (wage statements), 1099 (miscellaneous income), and various other tax filings. Always ensure accuracy when transcribing your FEIN on official documents.
Business applications: When applying for bank accounts, credit lines, or vendor accounts, you will typically provide your FEIN as primary business identification. Keep your FEIN documentation accessible for these applications.
Employment records: All employment-related documents, from new hire paperwork to termination records, should reference your FEIN for proper tax withholding and reporting.
Contractor payments: When paying independent contractors more than $600 annually, you will need to request their FEIN or SSN to properly report payments on Form 1099-NEC.
Important protections:
Never share your FEIN publicly or with unverified parties. While not as sensitive as a Social Security number, your FEIN can potentially be used for fraudulent activities. Only provide it to verified financial institutions, government agencies, legitimate business partners, and tax professionals.
Keep documentation of your FEIN assignment letter from the IRS in a secure location. While you can obtain a replacement FEIN letter from the IRS if needed, having the original documentation is convenient for business operations.
Frequently Asked Questions
What is the difference between FEIN and EIN?
FEIN stands for Federal Employer Identification Number, while EIN is the official IRS term for Employer Identification Number. Both refer to the same nine-digit number assigned by the IRS for federal tax purposes. The terms are used interchangeably in business contexts.
How long does it take to get a FEIN?
Applying online through the IRS website is the fastest method, typically providing your FEIN immediately upon completion of the application. Phone applications take about 15-20 minutes to process and provide the FEIN by the end of the call. Fax applications take approximately four business days, while mail applications take four to six weeks.
Does a FEIN expire?
No, a FEIN is valid for the life of the business entity. Once assigned, it remains associated with that business regardless of changes in ownership, location, business name, or operational status. You cannot transfer a FEIN to a different business entity, even if the new entity has a similar name or purpose.
Can I get a FEIN for a business I don’t own?
No, you cannot legitimately obtain a FEIN for a business you do not own or control. The application requires the responsible party to provide their personal identification and certify accuracy of the information. Applying for a FEIN for a business without authorization constitutes fraud and can result in significant legal penalties.
What if I lose my FEIN documentation?
If you lose documentation of your FEIN, you can obtain a copy of your FEIN assignment letter by calling the IRS at 1-800-829-4933 or by submitting Form 4506-T to request a transcript. Your FEIN remains valid regardless of documentation status, but having proof of your number is useful for banking, tax filing, and business operations.
Do I need a FEIN as a sole proprietor without employees?
Legally, no, if you do not file excise or employment tax returns. However, obtaining a FEIN is highly recommended even for sole proprietors without employees. It provides privacy protection by keeping your personal SSN off business documents, enables easier banking, and creates a more professional business identity. The application is free and takes only a few minutes online.
Conclusion
Understanding your FEIN definition and proper usage is fundamental to operating a compliant and professional business in the United States. This nine-digit identifier serves as your business’s primary connection to federal tax authorities, financial institutions, and the broader business community. Whether you’re starting a new venture or managing an established enterprise, your FEIN will play a crucial role in daily operations, tax compliance, and financial management.
The process of obtaining a FEIN is straightforward and free through the IRS online portal, typically providing immediate results. Once obtained, your FEIN remains valid for the lifetime of your business, requiring no renewal or renewal fees. Using your FEIN properly on tax documents, banking applications, and business transactions ensures compliance while protecting your business identity.
For any business that plans to hire employees, operate as a corporation or partnership, or engage in federal tax filing, obtaining a FEIN is not just advisable but mandatory. Even for small sole proprietorships without employees, the benefits of separation between personal and business identification make obtaining a FEIN a sound business decision. Take time to understand your FEIN, keep documentation secure, and use it appropriately across all business activities.
