An Employer Identification Number (EIN) is essential for every LLC, yet many business owners don't fully understand what it is or how to get one. This complete guide walks you through everything from basic definitions to step-by-step IRS application instructions.
An Employer Identification Number (EIN) is a unique 9-digit number assigned by the IRS to identify your business for tax purposes. It's also called a Federal Tax Identification Number (FTIN).
Why Your LLC Absolutely Needs an EIN
While single-member LLCs without employees can technically use their Social Security Number, getting an EIN is strongly recommended—and required in many situations. Here are the key reasons:
Business Banking
Required to open business bank accounts, get business credit cards, and establish business credit separate from personal credit.
Hiring Employees
Mandatory if you hire employees. Needed for payroll processing, tax withholding, and employment tax filings.
Tax Filing
Required for filing business tax returns (Form 1065 for partnerships, Form 1120 for corporations).
Liability Protection
Helps maintain separation between personal and business finances, strengthening your LLC's liability protection.
| Business Situation | EIN Required? | Reason |
|---|---|---|
| Single-Member LLC with no employees | Optional but recommended | Can use SSN, but EIN provides privacy and separates business/personal |
| Multi-Member LLC (any size) | Required | IRS requires EIN for partnerships filing Form 1065 |
| LLC with employees | Required | Needed for payroll tax reporting (Forms 941, 940) |
| LLC electing S-Corp or C-Corp taxation | Required | Corporations must have EIN for tax filings |
| Opening business bank account | Required | Banks require EIN for business accounts |
| Applying for business licenses | Usually required | Most states and localities require EIN for business licensing |
[WARNING] Critical Warning: Privacy Protection
Using your Social Security Number for business purposes exposes you to identity theft. Every vendor, contractor, and customer who receives your SSN in business transactions creates a potential security risk. An EIN keeps your personal SSN private.
Step-by-Step: How to Get Your EIN from the IRS
Step 1: Determine Your Eligibility
You must have a valid Taxpayer Identification Number (SSN, ITIN, or EIN) and your business must be located in the United States or U.S. Territories. The applicant (responsible party) must be an individual, not another business entity.
Key requirement: You must have a legitimate business reason for requesting an EIN. Forming an LLC qualifies as a legitimate reason.
Step 2: Gather Required Information
Before starting your application, collect all necessary information. You'll need to complete the application in one session—you cannot save and return.
Information You Need:
Exact name as registered with state
If different from legal name
Physical location (no P.O. boxes)
Name, SSN/ITIN, address of owner
LLC, date formed, state of formation
Started new business, hired employees, etc.
Step 3: Choose Your Application Method
The IRS offers multiple ways to apply for an EIN. Each has different processing times and requirements.
Online Application
Time: Immediate
Availability: Mon-Fri, 7AM-10PM EST
Best For: Most businesses
Limitation: Must complete in one session
Fax Application
Time: 4 business days
Fax: (855) 641-6935
Best For: International applicants
Form: SS-4 required
Mail Application
Time: 4-6 weeks
Address: IRS center in Cincinnati, OH
Best For: No rush situations
Form: SS-4 required
Telephone Application
Time: Immediate
Number: (800) 829-4933
Best For: International applicants
Hours: Mon-Fri, 7AM-7PM local time
Step 4: Complete Form SS-4 (If Not Applying Online)
For fax, mail, or phone applications, you'll need to complete IRS Form SS-4. Key sections to pay attention to:
- Line 1: Legal name of entity (exactly as on formation documents)
- Line 7a: Trade name if different (DBA)
- Line 8: Business mailing address
- Line 9: City, state, ZIP code for physical location
- Line 10: Responsible party name and SSN/ITIN
- Line 15: Reason for applying (check "Started new business")
- Line 18: Type of entity (check "Limited liability company")
[TIP] Pro Tip: Online is Best
The online application is the fastest, most reliable method. It guides you through each question, validates information in real-time, and provides your EIN immediately upon completion. Only use other methods if you have specific requirements (like international applications).
Step 5: Submit and Receive Your EIN
Submit your application using your chosen method. What to expect:
Online Application
Result: Immediate EIN display on screen
Confirmation: Download/print confirmation notice immediately
Next Step: IRS mails confirmation letter in 1-2 weeks
Fax Application
Result: Fax back with EIN in 4 business days
Confirmation: Keep fax confirmation as proof of submission
Next Step: IRS mails confirmation letter after fax
Mail Application
Result: Letter with EIN in 4-6 weeks
Confirmation: Use certified mail for tracking
Next Step: Letter serves as official confirmation
Step 6: Safeguard and Use Your EIN
Once you receive your EIN, take these important steps:
Download/print online confirmation or save mailed letter. Store in secure business records.
Only provide EIN to necessary parties: banks, IRS, vendors requiring it for tax purposes.
Add EIN to your business plan, operating agreement, and organizational documents.
Always use your EIN (not SSN) for business banking, taxes, licenses, and contracts.
What to Do After You Get Your EIN
Open Business Bank Account
Take your EIN confirmation and LLC documents to open dedicated business accounts.
Apply for Business Licenses
Use EIN for local, county, and state business license applications.
Establish Business Credit
Apply for business credit cards and vendor accounts using your EIN.
Hire Employees (If Needed)
Use EIN for payroll setup, tax withholding, and employment reporting.
[SUCCESS] Important: EIN vs. State Tax ID
Your EIN is your federal tax identification number. You may also need a separate state tax ID number for state tax purposes. The EIN comes from the IRS, while state tax IDs come from your state's department of revenue. Many states use your EIN, but some issue separate numbers.
Common Mistakes to Avoid
[WARNING] Critical EIN Application Errors
- Incorrect Business Name: Using a variation instead of exact legal name from formation documents
- Wrong Business Structure: Selecting wrong entity type (LLC vs Corporation)
- Missing Responsible Party: Forgetting to include owner's SSN/ITIN and information
- Rushing Online Application: Timing out or making errors by not preparing information first
- Using Personal Address: Using home address when you have a business location
- Not Saving Confirmation: Failing to download/print EIN confirmation immediately
Frequently Asked Questions
Is there a fee to get an EIN?
Answer: No. Getting an EIN directly from the IRS is completely free. Be cautious of third-party services charging fees—they're simply completing the same free application for you. Only use paid services if you need additional help or have complex situations.
Can I get an EIN before forming my LLC?
Answer: No. You must have your LLC officially formed with the state before applying for an EIN. The IRS requires your LLC's legal name and formation date, which you won't have until after state approval. Form your LLC first, then immediately apply for your EIN.
What if I lose my EIN confirmation letter?
Answer: You can call the IRS Business & Specialty Tax Line at (800) 829-4933. They can look up your EIN if you can verify your identity and business information. For faster service, check your bank account applications or tax returns where the EIN is recorded.
Do I need a new EIN if I change my business name?
Answer: Generally no. Your EIN stays the same even if you change your business name, location, or add owners. You only need a new EIN if you change your business structure (e.g., from sole proprietorship to LLC) or inherit a business.
Can non-US citizens/residents get an EIN?
Answer: Yes, but the process is different. Non-residents without an SSN need an Individual Taxpayer Identification Number (ITIN) first, or they must apply by fax or mail using Form SS-4. International applicants cannot use the online system and should use the fax method.
[TIP] When to Consider Professional Help
Most LLCs can easily get their EIN online without help. Consider professional assistance if: 1) You're a non-resident without an SSN/ITIN, 2) You have complex ownership structures, 3) You're converting from another business type, or 4) You've been denied an EIN and need to resolve issues.
Final Checklist: EIN Application Success
Have state approval and formation documents before applying
Collect all required information before starting application
Use IRS online application for immediate results
Set aside 15-20 minutes without interruptions
Download/print confirmation immediately after receiving EIN
Update all business accounts and documents with new EIN
[SUCCESS] Key Takeaway
Getting an EIN is one of the simplest yet most important steps in establishing your LLC. It's free, quick (when done online), and essential for separating your business identity from your personal identity. Don't put it off—apply for your EIN immediately after forming your LLC to unlock banking, credit, and hiring capabilities.
[WARNING] Remember This
Your EIN is permanent for your LLC. Once assigned, it never expires and stays with your business for its entire existence. Treat it with the same care as your Social Security Number—it's a key identifier that should be protected and used appropriately.
