SS-4 Form Guide: Step-by-Step to Fill Out Your EIN Application (With Sample)

Table of Contents#

1. What is the SS-4 Form?
2. Who Needs to File the SS-4 Form?
3. Prerequisites to Fill Out the SS-4 Form
4. Step-by-Step Breakdown of the SS-4 Form
5. Sample SS-4 Form Application (Hypothetical Business)
6. How to Submit Your SS-4 Form
7. Common Mistakes to Avoid
8. Frequently Asked Questions (FAQs)
9. Conclusion
10. References

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1. What is the SS-4 Form?#

The SS-4 Form is the Internal Revenue Service (IRS) official document used to apply for an EIN. This unique 9-digit number identifies your business for tax purposes, including filing federal tax returns, paying payroll taxes, and registering for state tax accounts.

The form is free to use, and you can submit it online, by mail, fax, or phone (for international applicants). It asks for basic information about your business structure, operations, and responsible parties to verify your eligibility for an EIN.

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2. Who Needs to File the SS-4 Form?#

You must file the SS-4 Form if you fall into any of these categories:

• Sole proprietorships hiring employees or opening a business bank account (instead of using your SSN)
• Limited Liability Companies (LLCs) or Limited Liability Partnerships (LLPs)
• Corporations (C-corps, S-corps)
• Partnerships
• Nonprofit organizations and charities
• Trusts and estates
• Government agencies or tribal entities
• Businesses that file excise taxes (e.g., alcohol, tobacco)
• Foreign businesses operating in the U.S.

You do NOT need to file an SS-4 Form if you’re a sole proprietor without employees and use your SSN for all tax and financial transactions.

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3. Prerequisites to Fill Out the SS-4 Form#

Before you start filling out the form, gather these key details to avoid interruptions:

• Business legal name: The exact name on your formation documents (e.g., articles of incorporation, LLC operating agreement)
• Trade name (DBA): If your business operates under a different name than its legal name
• Physical business address: Cannot be a PO box unless it’s your only address (IRS requires a street address for verification)
• Mailing address: Where you want IRS correspondence sent (can be a PO box)
• Responsible party details: Full name, SSN/Individual Taxpayer Identification Number (ITIN), and role in the business (the person who controls or manages the business’s finances)
• Business structure: Corporation, LLC, partnership, etc.
• Business start date: Month, day, and year your business began operations
• Accounting year end: The month your business closes its books (most businesses use December)
• Expected employee count: Number of full-time, part-time, and seasonal employees in the next 12 months
• Principal business activity: A clear description of your core operations (e.g., "residential landscaping services")
• Principal business activity code: A 6-digit code from the IRS’s NAICS Code List that matches your industry

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4. Step-by-Step Breakdown of the SS-4 Form#

The SS-4 Form has 20 sections. Below is a detailed explanation of each:

Section 1: Legal Name of Entity or Individual#

Enter the full legal name of your business or the individual applying (for sole proprietorships). This must match the name on your formation documents or government ID.

Section 2: Trade Name (DBA)#

If your business operates under a "Doing Business As" name, enter it here. Leave blank if you don’t have a DBA.

Section 3: Executor, Administrator, or Trustee Name#

Only fill this out if you’re applying for an estate or trust. Enter the name of the person managing the estate/trust.

Section 4: Mailing Address#

Enter the address where you want the IRS to send your EIN confirmation letter and other correspondence. This can be a PO box.

Section 5: Street Address#

Enter the physical street address of your business. PO boxes are not allowed here unless it’s your only address (e.g., home-based businesses can use their home address).

Section 6: Responsible Party#

Enter the full name, SSN/ITIN, and address of the responsible party. The IRS defines this as the person who "controls, manages, or directs the entity and the disposition of its funds and assets." For most small businesses, this is the owner, CEO, or managing partner.

Section 7: Business Entity Type#

Check the box that best describes your business structure:

• Corporation (C or S)
• LLC
• Partnership
• Sole proprietorship
• Estate/Trust
• Other (specify, e.g., nonprofit)

Section 8: Reason for Applying#

Select the reason you’re requesting an EIN:

• New business
• Hiring employees
• Banking purpose (e.g., opening a business account)
• Change of business name
• Purchasing an existing business
• Other (specify)

Section 9: Date Business Started or Acquired#

Enter the month, day, and year your business began operations or was acquired.

Section 10: Closing Month of Accounting Year#

Enter the month your business ends its fiscal year. Most businesses use December (calendar year), but you can choose any month.

Section 11: Number of Employees Expected in the Next 12 Months#

Enter the total number of full-time, part-time, and seasonal employees you plan to hire in the next year. If you don’t plan to hire employees, enter 0.

Section 12: First Date Wages or Pensions Will Be Paid#

If you’re hiring employees, enter the date you’ll first pay wages. Leave blank if you don’t plan to hire.

Section 13: Principal Activity#

Describe your business’s core operations in 1-2 sentences (e.g., "Providing residential lawn care and landscaping services to customers in Delaware").

Section 14: Principal Activity Code#

Enter the 6-digit NAICS code that matches your industry. For example:

• Landscaping services: 561730
• Coffee shop: 722515
• Accounting firm: 541211

Section 15: Highest Officer, General Partner, Grantor, Owner, etc.#

Enter the name and title of the highest-ranking person in your business (e.g., "John Doe, Owner" for an LLC, "Jane Smith, CEO" for a corporation).

Section 16: State of Formation#

For corporations and LLCs, enter the state where your business was formed (e.g., Delaware, California). Leave blank for sole proprietorships or partnerships.

Section 17: County and State Where Business is Located#

Enter the county and state of your business’s physical address (from Section 5).

Section 18: Other Information#

Use this section to add any additional details the IRS might need (e.g., if you’re applying for a foreign business operating in the U.S.).

Section 19: Requested Method of Receipt#

Choose how you want to receive your EIN:

• Online: Instant EIN (only available for U.S.-based businesses)
• Mail: EIN confirmation letter sent in 4-6 weeks
• Fax: EIN sent in 4 business days (include your fax number)

Section 20: Signature#

The responsible party (from Section 6) must sign and date the form. For online applications, this is done electronically.

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5. Sample SS-4 Form Application (Hypothetical Business)#

Let’s use a hypothetical business to demonstrate how to fill out the SS-4 Form: Business: GreenLeaf Landscaping LLC (DBA: GreenLeaf Lawn Care) Responsible Party: John Doe (Owner, SSN: 123-45-6789) Location: 123 Oak Street, Wilmington, DE 19801

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6. How to Submit Your SS-4 Form#

You have four options to submit your SS-4 Form:

1. Online (Fastest): Apply via the IRS EIN Assistant. You’ll receive your EIN instantly upon approval. Only available for U.S.-based businesses with a responsible party who has an SSN/ITIN.
2. Mail: Send the completed form to the IRS address corresponding to your state. For example:
   • East Coast businesses: IRS, Cincinnati, OH 45999-0014
   • West Coast businesses: IRS, Ogden, UT 84201-0014 Processing time: 4-6 weeks.
3. Fax: Fax the form to (855) 641-6935 (for U.S. businesses) or (304) 707-9471 (international). You’ll receive your EIN in 4 business days.
4. Phone: International applicants can call (267) 941-1099 (Monday-Friday, 6 a.m.-11 p.m. ET) to apply over the phone. You’ll receive your EIN immediately.

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7. Common Mistakes to Avoid#

To prevent delays or rejection of your application:

• Incorrect responsible party info: The IRS requires a valid SSN/ITIN for the responsible party. Using a business EIN here is not allowed.
• PO box as street address: Section 5 must include a physical street address (unless it’s your only address).
• Wrong business entity type: Choosing the wrong structure (e.g., marking "corporation" for an LLC) can lead to tax classification issues.
• Missing signature: The responsible party must sign the form (or electronically confirm for online applications).
• Incorrect activity code: Using a code that doesn’t match your industry can cause the IRS to flag your application.

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8. Frequently Asked Questions (FAQs)#

Q: How long does it take to get an EIN?#

• Online: Instantly.
• Mail: 4-6 weeks.
• Fax: 4 business days.
• Phone (international): Immediately.

Q: Can I apply for an EIN online if I’m not a U.S. citizen?#

Yes, but you must have an ITIN and be a U.S.-based business. International businesses must apply by phone or fax.

Q: What if I make a mistake on my SS-4 Form?#

If you submitted online, you can correct errors by calling the IRS at (800) 829-4933. For mail/fax applications, wait for your EIN confirmation, then request changes via phone or mail.

Q: Can I reuse an EIN for a new business?#

No. Each separate business entity needs its own EIN. If you change your business structure (e.g., from sole proprietorship to LLC), you must apply for a new EIN.

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9. Conclusion#

Filling out the SS-4 Form doesn’t have to be complicated. By gathering the right information, following the step-by-step breakdown, and using our sample application as a guide, you can complete your EIN application quickly and accurately. Remember to choose the fastest submission method (online for U.S. businesses) to get your EIN instantly and start operating your business legally.

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10. References#

• IRS SS-4 Form: https://www.irs.gov/pub/irs-pdf/fss4.pdf
• IRS EIN Application Guide: https://www.irs.gov/businesses/small-businesses-self-employed/employer-identification-numbers-eins
• NAICS Code List: https://www.census.gov/naics/