CP575 Complete Guide: EIN Confirmation Letter Every LLC Owner and Entrepreneur Must Know

An LLC, or Limited Liability Company, is a popular business structure that offers the best of both worlds: personal asset protection and pass-through taxation. Many business owners choose this structure for its simplicity and flexibility.

CP575 is the official confirmation letter sent by the Internal Revenue Service (IRS), also known as the EIN Confirmation Letter (EIN Assignment Notice). For business owners and entrepreneurs looking to register an LLC in the United States, this document is crucial. This comprehensive guide will explain everything you need to know about CP575.

Part 1: What is CP575?

Definition

What Information Does CP575 Contain?

CP575 is more than just a confirmation slip—it's an official document containing the following important business information:

9-digit EIN number - Your business's federal tax identification number
Legal business name - The exact name registered on Form SS-4
Business address - Mailing and business addresses provided in the SS-4 application
Business entity type - LLC, partnership, corporation, sole proprietorship, etc.
EIN assignment date - The date the IRS officially assigned your EIN
Responsible party information - Name and Social Security Number of the business owner or principal officer
Required tax forms - List of federal tax forms your business must file and filing deadlines

Legal Status of CP575

The IRS only issues one original CP575. If you lose this important document, the IRS will not reissue the same CP575, but will provide an alternative document called Letter 147C (EIN Verification Letter), which serves essentially the same function.

Part 2: Do You Need CP575?

Who Needs to Obtain an EIN (and thus receive CP575)

While not all businesses need an EIN, you must obtain one (and thus receive CP575) in the following situations:

1. Businesses with employees
If you plan to hire employees or already have employees, you must have an EIN.

2. Business entities
If your business is organized as:

Limited Liability Company (LLC)
Partnership
Corporation (C-Corp or S-Corp)
Non-profit organization
Trust or estate
Government agency

3. Specific tax form requirements
If you need to file any of the following tax forms:

Employment tax forms (required for employers)
Excise tax forms
Alcohol, tobacco, and firearms tax forms

4. Withholding tax obligations
If you withhold taxes on non-wage income of non-resident aliens

5. Keogh plans
If you establish a self-employed retirement plan

6. Other organizational structures
If you are a trust, non-profit association, or other organization requiring federal tax identification

Who Doesn't Need EIN and CP575

Sole proprietors (single-owner businesses without employees) can use their Social Security Number instead of an EIN for tax purposes. In this case, you may not need to apply for an EIN and therefore won't receive CP575.

However, even if technically not required, many sole proprietors still apply for an EIN for privacy protection, business bank account opening, and other purposes.

If you're considering registering an LLC, we recommend reading our Complete Guide for Non-US Residents to Start an LLC to understand the detailed registration process and EIN application steps.

Part 3: How to Obtain CP575

Overview of the Process

The process to obtain CP575 is simple: apply for an EIN, and the IRS will automatically send CP575. Here are the detailed steps.

Step 1: Determine if You Qualify

Use the checklist from Part 2 above to confirm whether your business needs an EIN. If your business structure is an LLC (even without employees), you may still want to apply for an EIN.

If you plan to register an LLC in Wyoming, an EIN is required, as Wyoming requires all LLCs to have an EIN.

Step 2: Fill Out Form SS-4

The prerequisite for CP575 is applying for an EIN. You need to fill out Form SS-4 (Application for Employer Identification Number). This form requires you to provide:

Legal business name
Business address (mailing and business addresses)
Business structure and industry classification
Owner or responsible party information
Business start date or expected date
Number of employees (if applicable)

Step 3: Choose Submission Method and Submit SS-4

You have three ways to submit SS-4:

1. Online application (Recommended - Fastest method)

Through the IRS online EIN application system:

Get EIN immediately (can be used right away)
No mailing or faxing required
Suitable for most applicants
Processing time: Real-time

2. Fax submission

Download Form SS-4 from the IRS website and fill it out
Fax to the appropriate IRS center (based on your location)
Processing time: Usually 1-2 days

3. Mail submission

Mail the completed paper form to the appropriate IRS service center
Processing time: Usually 4-6 weeks (may be longer during peak periods)

Step 4: Receive Your CP575

Online applicants: You'll see your EIN number immediately and can use it right away
Fax/Mail applicants: The IRS will mail the official CP575 letter to the address specified in your SS-4 form

CP575 is typically sent via postal mail by the IRS office after processing to your registered address.

Processing Time Expectations

Application Method	Processing Time
Online application	Immediate
Fax submission	1-2 days
Mail submission	4-6 weeks (up to 3 months during peak periods)

Tip: If you're in a hurry, we recommend choosing online application or fax submission.

Part 4: CP575 vs Letter 147C - Complete Comparison

Many small business owners are confused about CP575 and 147C. Here's a detailed comparison to help you understand the differences and choose:

Feature	CP575 Letter	Letter 147C
Official Name	EIN Confirmation Letter	EIN Verification Letter
When Issued	Automatically sent when EIN is first assigned	Sent upon request (as replacement)
Primary Purpose	Confirms your newly assigned EIN and business details	Verifies that existing EIN is valid
How to Obtain	Automatically sent via mail	Must be actively requested
Difficulty to Obtain	No action required (automatic)	Requires active contact with IRS
Processing Time	4-6 weeks after EIN application	Same-day fax via phone; 4-6 weeks via mail
Can Be Reissued	No (issued only once)	Yes (can be requested multiple times)
Bank Acceptance	Preferred (first choice)	Widely accepted
Information Included	More detailed (includes tax form information)	Basic information (EIN, name, address)
Legal Validity	Permanently valid	Permanently valid

When to Use Which

Use CP575 when:

You still have the original document
You need to show official proof of EIN issuance
Financial institutions explicitly require the original confirmation letter
Building business credit history

Use 147C when:

You've lost the original CP575
The original CP575 never arrived or was lost in the mail
You need a replacement verification document
You need quick verification (can be faxed same day via phone)
You need multiple copies for different institutions

Part 5: Practical Applications of CP575

1. Opening a Business Bank Account

This is the most common and important use of CP575. Banks need to verify when opening commercial accounts:

The EIN actually belongs to your business
Your business's legal name, address, and ownership structure
Legitimacy of the business entity

CP575, as an official document issued by the IRS, perfectly meets this requirement.

Action recommendations:

Prepare a copy or scan of CP575 before opening an account
Some banks (especially online banks) will accept digital copies
Traditional banks may require the original or certified copy

If you're a non-US resident, you can refer to our Non-US Resident LLC Registration Guide to learn how to combine CP575 with opening a US bank account.

2. Applying for Business Credit Cards and Loans

Financial institutions need to verify your EIN when establishing your business credit profile. CP575 serves as key proof of your business's legitimacy and authenticity.

This applies to:

Business credit card applications
Business loans and lines of credit
SBA loans (Small Business Administration)
Merchant cash advances

3. Setting Up Payroll and Employee Management

When you hire employees, you need to provide your EIN to your payroll provider. The information in CP575 helps ensure:

Payroll system correctly links to your business
Tax withholding is set up correctly
Employee W-4 forms are processed correctly

4. State and Local License Applications

Many state and local governments require EIN verification before issuing business licenses. CP575, as a federal-level verification document, supports these applications.

If you're considering registering an LLC in Wyoming, CP575 is a required verification document.

5. Supplier and Contractor Relationships

In B2B partnerships, your partners and suppliers may require EIN verification for tax reporting purposes (especially 1099 reporting). CP575 provides official verification.

6. Government Contracts and Bidding

If your business wants to bid on government projects or obtain contracts from the government, EIN and business information verification is usually required. CP575 is the standard verification document.

7. Business Credit Reports

When establishing business credit history, credit reporting agencies use the information in CP575 to verify your business identity. This is important for:

Establishing Dun & Bradstreet business credit profile
Applying for higher business credit limits
Obtaining better supplier terms

Part 6: What to Do If You Lose Your CP575

Don't Worry - There Are Multiple Solutions

Although the IRS won't reissue the original CP575, you have several options to verify your EIN.

Option 1: Request Letter 147C Replacement (Official Recommendation)

This is the IRS's officially recommended solution. Letter 147C (EIN Verification Letter) is acceptable in most situations.

Apply by phone (fastest method):

Call IRS Business and Specialty Tax Line
- Phone number: 1-800-829-4933
- Service hours: Monday-Friday, 7 AM-7 PM (local time)
- Typical wait time: 10-30 minutes (depends on time and season)
Prepare to provide the following information
- Your business's legal name (exact name on SS-4)
- EIN number (if you remember it)
- Business address
- Responsible party name and Social Security Number
- Business start date
Request: Apply for EIN Verification Letter (Form 147C)
Choose delivery method
- Via fax: Usually can be completed same day (fastest)
- Via mail: IRS will mail the official document

Apply by mail:

Write a formal letter to the IRS including:
- Current date
- Your business's legal name
- Your EIN number (if you have it)
- Your mailing address
- Simple statement: "Please send EIN Verification Letter (Form 147C) for the above business"
Mail to the appropriate IRS service center
Processing time: 4-6 weeks
After receiving, scan and save a digital copy

Option 2: Check Other Documents for Your EIN

If you can't get a replacement letter immediately, your EIN may appear in the following documents:

Previously filed business tax returns - Any 1040-ES, 1120, 1120-S forms contain your EIN
Business bank account documents - Bank statements, account opening agreements
Business loan application documents - Any submitted loan applications or loan documents
State business licenses - Many state licenses explicitly list your EIN
Employee payroll records - If you have employees, payroll records will show your EIN
1099 forms - 1099 forms received as an independent contractor or supplier will list your EIN
Business insurance policies - Many insurance policies list your EIN

Option 3: Contact Your Tax Professional

If you applied for an EIN through the following channels, their files may contain your EIN or can help you retrieve it:

Tax accountant or CPA
Business attorney
LLC registration service or business formation service (such as Doola Registered Agent Service)
Business consultant

Tip: Keep your original formation documents, which should contain your EIN.

Part 7: Special Considerations - International Entrepreneurs and Non-US Residents

For international entrepreneurs looking to register an LLC in the United States, CP575 has additional importance as it represents the critical first step into the US business and financial ecosystem.

Why International Entrepreneurs Need CP575

1. Entering the US Financial Ecosystem

CP575 verifies the legitimacy of your US business, which is crucial for:

US banks and financial institutions
Payment processors (Stripe, PayPal, etc.)
E-commerce platforms (Amazon, eBay, Shopify, etc.)

2. Opening a US Bank Account

Many US banks have additional identity verification requirements for international applicants. CP575, as an IRS document, provides undeniable proof that your business exists.

If you're a non-US resident, we strongly recommend reading our Complete Guide for Non-US Residents to Register an LLC to learn detailed steps on how to combine CP575 with opening a US bank account.

3. Payment Processor Integration

If you want to sell online or provide services, payment processors like Stripe, PayPal, Square need to verify your EIN. CP575 is the standard verification document.

4. Platform Selling Permissions

Platforms like Amazon, eBay, Etsy have additional verification steps for international sellers. CP575 can expedite this process.

5. US Business Credibility

For many international entrepreneurs, having a US EIN and CP575 represents proof of entry into the world's largest business market.

Specific Steps for Non-US Residents

SS-4 Online Application Differences:

The IRS online EIN application tool typically requires:
- Social Security Number (SSN) or Individual Taxpayer Identification Number (ITIN)
- Or passport number (for international applicants)
Many international entrepreneurs may need to:
- Apply for ITIN (if they don't have a US SSN)
- Or use passport number
In some cases, you may need to submit SS-4 via mail or fax

Processing Time Differences:

Online application (if eligible): Real-time
Mail application: 6-12 weeks (may be longer for international mail)
Fax application: 2-3 weeks

Recommended Practices:

If possible, choose online application - Fastest and most reliable
Keep copies of all documents - Copies of SS-4 application and confirmation
Digitize CP575 immediately after receiving - Scan and securely store multiple copies
Consider virtual mailbox service - If you don't have a physical US address, you can use a virtual mailbox service to receive CP575

Additional Recommendations for International Entrepreneurs

Building US Business Identity:

CP575 is the first step, but not the only one
Also consider:
- US business bank account (such as Wise Business or Mercury)
- US business address (virtual office or forwarding address)
- US business credit card
- Business Tax Identification Number (ITIN, if needed)

Avoid Common Mistakes:

Don't try to open a bank account without an EIN (will be rejected)
Don't lose the original CP575 (can be difficult to replace, especially if lost in mail)
Don't miss tax filing deadlines (IRS is equally strict with international entities)

If you're considering using a registered agent service, you can compare Doola with other registered agent services to choose the service that best meets your needs.

Part 8: Frequently Asked Questions

Q1: Do I need CP575 to file taxes?

A: You need an EIN number to file taxes, but you don't need to physically hold the CP575 document. If your business requires an EIN, you need to use that EIN to file taxes regardless of whether you have the CP575 document. However, CP575 as official proof of your EIN is very useful, especially for verification purposes.

Q2: What's the difference between CP575 and SS-4?

A: Simply put:

SS-4 is the form you fill out to request an EIN
CP575 is the confirmation letter sent by the IRS proving you've received an EIN

One is input (request), the other is output (confirmation).

Q3: Can I open a bank account without CP575?

A: Maybe, but it will be more difficult. Many banks accept other forms of EIN verification (such as tax returns or Letter 147C), but CP575 is preferred. If you don't have CP575, you can:

Apply for Letter 147C replacement
Show previously filed business tax returns
Provide driver's license and other identification
Communicate directly with the bank about alternative verification methods

If you're a non-US resident, we recommend referring to our Non-US Resident LLC Registration Guide to understand detailed requirements for opening a bank account.

Q4: Does CP575 expire?

A: No. CP575 is permanently valid. The EIN it proves doesn't change, so the document remains valid for the duration of your business. You can use it at any time.

Q5: Can a business have multiple EINs or CP575s?

A: In principle, no. A business structure should have one unique EIN. If you accidentally applied for multiple, you should contact the IRS as soon as possible to correct this issue to avoid tax problems.

Q6: Can I view my CP575 online?

A: No. The IRS doesn't provide an online CP575 lookup system. If you need to verify your EIN, you need to:

Find a copy of your original CP575
Apply for Letter 147C (can be faxed via phone or requested by mail)
Check previously filed tax returns (will list your EIN)

Q7: How long does it take for CP575 to arrive?

A: Typically:

Online application: Immediately available (no mailing required)
Mail application: 4-6 weeks (sometimes up to 12 weeks during peak periods)
Fax application: 1-2 days
If you haven't received it after 6 weeks, you can call the IRS to follow up

Q8: What if I change my business name?

A: Your EIN and the business name in CP575 represent your legal name in IRS records. If you change your business name, you may need to:

Update business name at state level (amended LLC agreement)
Notify IRS about name change (fill out new forms)
In some cases, you may need to apply for a new EIN

We recommend consulting a tax professional to ensure compliance.

Q9: What is EIN fraud and how do I protect my CP575?

A: EIN fraud occurs when criminals use someone else's EIN to:

Apply for fraudulent loans or credit lines
Open fraudulent accounts
File fraudulent tax returns
Commit identity theft

Protection measures:

Don't share your CP575 copy online or via email
Securely store original CP575 (safe or secure location)
Only provide EIN to legitimate, verifiable financial institutions
Regularly check your credit reports and business credit
If you discover EIN misuse, immediately report to IRS (phone 1-800-829-4933)

Q10: I'm a sole proprietor, do I really need an EIN and CP575?

A: Technically, if you don't have employees and don't have specific tax form requirements, you don't need an EIN. But consider the benefits of applying:

Privacy: Use EIN in business transactions instead of SSN (Social Security Number)
Business bank account: Many banks prefer business accounts with EIN
Business credit: Helps establish independent business credit history (separate from personal credit)
Growth flexibility: If you hire employees in the future, you already have an EIN
Professionalism: Shows a more professional business image to customers and partners

Conclusion: For most small business owners, even if technically not required, applying for an EIN and obtaining CP575 is still a wise business decision.

Part 9: Next Steps

Now that you have comprehensive knowledge about CP575, here are recommended steps based on your specific situation:

If You Don't Have an EIN Yet

1. Assess if you need one

Review the checklist in Part 2
If your business is an LLC or has employees, the answer is yes

2. Prepare SS-4 application

Collect required business information
Prepare owner/responsible party information
Clarify your business structure (LLC, S-Corp, etc.)

3. Apply for EIN online (recommended)

Apply through IRS website (fastest method)
Record your EIN immediately
No need to wait for mail

4. Wait and receive CP575

If applying by mail, wait 4-6 weeks
Scan immediately after receiving
Securely store original and digital copies

5. Use your EIN

Open business bank account
Establish supplier accounts
Apply for necessary licenses

If you haven't registered an LLC yet, you can check our Get Started Guide to learn the complete LLC registration process.

If You Already Have an EIN but Lost CP575

1. Assess urgency

Do you need it immediately? (bank application, etc.)
Or do you have time to wait?

2. Quick solution (within 24 hours)

Call IRS: 1-800-829-4933
Apply for 147C (EIN Verification Letter)
Request fax delivery (same day)

3. Long-term solution

Save copies for future use
Scan and digitize storage
Protect original

If You're Considering Registering an LLC in the US

1. Choose formation state

Consider your business needs
Research state requirements (Delaware, Wyoming are popular)
View our State LLC Guides to compare different state requirements

2. Form your LLC

File documents with Secretary of State
Pay filing fees
Obtain business certificate (State Certificate)

3. Apply for EIN

Fill out SS-4 form
Apply online (fastest)
Record your EIN

4. Wait and receive CP575

Typically 4-6 weeks
Scan immediately upon receiving
Save multiple copies

5. Build business infrastructure

Open business bank account (using CP575)
Set up payroll system (if you have employees)
Apply for necessary state and local licenses
Establish business credit

6. Set up tax and compliance

Consult tax professional
Understand your tax filing requirements
Establish accounting system
Record business expenses

If you want to learn about LLC registration costs, you can check our LLC Registration Cost Guide.

Summary

CP575 may seem like a simple document, but it's actually a critical certificate for your US business. It verifies your business identity in IRS records and is the foundation for opening bank accounts, obtaining financing, hiring employees, and doing business with partners.

Key Takeaways

✅ Easy to obtain - Just apply for EIN, IRS automatically sends CP575

✅ Protection is important - This is official proof of your business identity and should be stored securely

✅ Loss is not a disaster - 147C is an official replacement document that can be requested at any time

✅ Critical for international entrepreneurs - This is your entry ticket into the US business ecosystem

✅ Long-term asset - CP575 is permanently valid, you can use it at any time

Special Reminder for International Entrepreneurs

If you're an international entrepreneur seeking to enter the US market, CP575 and EIN are your first steps to success. These documents enable you to:

Enter the US financial system
Accept payments from US customers
Sell on US e-commerce platforms
Establish US business credit
Obtain US financial products

Don't overlook this step. This is the foundation of your US business success.

If you need more help, you can check our About Us page to learn how we help global entrepreneurs establish and grow their US businesses.

If you want to learn more about related topics, please refer to the following resources:

IRS Official EIN Page: Provides the latest official information and forms
Complete Guide to LLC Registration: Learn how to register an LLC in various states
Guide for International Entrepreneurs to Register LLC in US: Specific steps for non-US residents
3 Major Pitfalls Guide for Non-US Residents LLC Registration: Avoid common mistakes
Doola Registered Agent Service Comparison: Choose the registration service that best fits your needs
Wyoming LLC Registration Guide: Learn about the most popular LLC registration state
Business Tax Reporting and Compliance Checklist: Understand your annual tax obligations
US Business Bank Account Opening Guide: Step-by-step guide to opening a commercial bank account

Final Words

Now you have professional knowledge about CP575. You not only understand what it is, but also why it's so important for your US business and how to use it to build a strong business foundation.

Whether you're an international entrepreneur or a US-based business owner, CP575 is a critical milestone in your business journey. Take action now, obtain your EIN, receive your CP575, and then build your US business dream.

You're ready. Let's get started!

Last updated: January 12, 2026

This content is for educational purposes only. For specific tax or legal advice, please consult a qualified tax professional or attorney.

llcclass.com: Helping global entrepreneurs establish and grow their US businesses.

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