What is an EIN Number?
An EIN (Employer Identification Number) is a unique nine-digit number assigned by the IRS to identify your business for tax purposes. It works like a Social Security Number but for your business. Every LLC, corporation, and most other business entities in the US need an EIN.
Why Do You Need an EIN?
- Open a US business bank account
- File federal and state tax returns
- Hire employees legally
- Apply for business licenses and permits
- Establish business credit
- Process payroll
Who Needs an EIN?
- All multi-member LLCs
- Single-member LLCs that have employees
- Corporations (C-Corp and S-Corp)
- Partnerships
- Non-profit organizations
- Foreign nationals operating a US business
How to Apply for an EIN
There are four ways to apply for an EIN:
- Online (Fastest): Apply directly on the IRS Company Website">website at irs.gov. Available for US residents with an SSN or ITIN Number Guide">ITIN. EIN is issued immediately upon completion.
- By Fax: Complete Form SS-4 and fax to the IRS. Processing takes 4 business days.
- By Mail: Mail completed Form SS-4 to the IRS. Processing takes 4–5 weeks.
- By Phone (International): Foreign applicants without a US SSN can call the IRS at +1-267-941-1099. Available Monday–Friday, 6am–11pm ET.
EIN Application for Foreign Nationals
If you are a non-US resident forming a US LLC, you can still obtain an EIN. The process is slightly different:
- You cannot apply online without a US SSN or ITIN Number Guide">ITIN
- You must use the phone or fax method
- Alternatively, you can hire a third-party services" class="text-teal-600 hover:text-teal-700 font-medium underline decoration-teal-300 hover:decoration-teal-500 transition-colors">service to obtain the EIN on your behalf using a Form 2848 (Power of Attorney)
EIN vs ITIN Number Guide">ITIN
| Feature | EIN | ITIN Number Guide">ITIN |
|---|---|---|
| Purpose | Business identification | Individual tax filing |
| Who Needs It | Businesses | Individuals without SSN |
| Issued By | IRS | IRS |
| Format | XX-XXXXXXX | 9XX-XX-XXXX |
Conclusion
Getting an EIN is one of the first steps after forming your US LLC. It is free, relatively quick to obtain, and essential for operating your business legally in the United States. Do not delay this step — without an EIN, you cannot open a bank account or file taxes.