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The IRS SS-4 form plays a crucial role in the establishment of a business entity in the United States. When starting a new business, one of the first steps an entrepreneur must take is to obtain an Employer Identification Number (EIN), and this is where the SS-4 form comes into play. This application form is designed to collect essential information about the business, including its legal structure, the reason for applying for an EIN, and details about the responsible party. Whether you are a sole proprietor, a partnership, or a corporation, filling out the SS-4 form accurately is vital, as it not only facilitates the identification of your business for tax purposes but also helps in opening bank accounts and applying for licenses. Understanding the nuances of this form can save time and prevent potential headaches down the road. With the right guidance, completing the SS-4 form can be a straightforward process, paving the way for your business to thrive.

IRS SS-4 Example

Form SS-4

Application for Employer Identification Number

OMB No. 1545-0003

(For use by employers, corporations, partnerships, trusts, estates, churches,

EIN

(Rev. December 2025)

government agencies, Indian tribal entities, certain individuals, and others.)

 

Department of the Treasury

See separate instructions for each line. Keep a copy for your records.

 

Internal Revenue Service

Go to www.irs.gov/FormSS4 for instructions and the latest information.

 

1Legal name of entity (or individual) for whom the EIN is being requested

clearly.

4a

Mailing address (room, apt., suite no. and street, or P.O. box)

5a

Street address (if different) (Don’t enter a P.O. box.)

 

 

2

Trade name of business (if different from name on line 1)

 

3

Executor, administrator, trustee, “care of” name

 

print

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4b City, state, and ZIP code (if foreign, see instructions)

 

 

 

5b City, state, and ZIP code (if foreign, see instructions)

 

or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Type

6

County and state where principal business is located

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7a Name of responsible party

 

 

 

 

 

 

7b SSN, ITIN, or EIN

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8a Is this application for a limited liability company (LLC)

 

 

 

 

 

 

8b

If 8a is “Yes,” enter the

number

of

 

 

 

(or a foreign equivalent)?

Yes

 

 

No

 

LLC members

 

 

8c

 

If 8a is “Yes,” was the LLC organized in the United States? .

. .

. . . . . . . . . . . .

. . .

Yes

No

9a Type of entity (check only one box). Caution: If 8a is “Yes,” see the instructions for the correct box to check.

 

 

 

 

 

 

 

Sole proprietor (SSN)

 

 

 

 

 

 

 

 

 

Estate (SSN of decedent)

 

 

 

 

 

 

 

 

Partnership

 

 

 

 

 

 

 

Plan administrator (TIN)

 

 

 

 

 

 

 

 

Corporation (enter form number to be filed)

 

 

 

 

 

 

 

 

Trust (TIN of grantor)

 

 

 

 

 

 

 

 

Personal service corporation

 

 

 

 

 

 

 

Military/National Guard

State/local government

 

 

 

 

Church or church-controlled organization

 

 

 

 

 

 

 

Farmers’ cooperative

Federal government

 

 

 

 

Other nonprofit organization (specify)

 

 

 

 

 

 

 

 

REMIC

Indian tribal governments/enterprises

 

 

 

Other (specify)

 

 

 

 

 

 

Group Exemption Number (GEN) if any

 

 

9b

 

If a corporation, name the state or foreign country (if

 

State

 

 

 

 

Foreign country

 

 

 

 

applicable) where incorporated

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10 Reason for applying (check only one box)

 

 

Banking purpose (specify purpose)

 

 

 

 

 

 

 

 

Started new business (specify type)

 

 

Changed type of organization (specify new type)

 

 

 

 

 

 

 

 

 

 

 

 

 

Purchased going business

 

 

 

 

 

 

 

Hired employees (Check the box and see line 13.)

 

 

Created a trust (specify type)

 

 

 

 

 

 

 

 

Compliance with IRS withholding regulations

 

 

Created a pension plan (specify type)

 

 

 

 

 

 

 

Other (specify)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11 Date business started or acquired (month, day, year). See instructions.

 

 

12 Closing month of accounting year

 

 

13Highest number of employees expected in the next 12 months (enter -0- if none). 14 If you expect your employment tax liability to be $1,000 or less in a

If no employees expected, skip line 14.

 

 

full calendar year and want to file Form 944 annually instead of Forms

 

 

 

 

 

941 quarterly, check here. (Your employment tax liability will generally

Agricultural

 

Household

 

Other

be $1,000 or less if you expect to pay $5,000 or less, $6,536 or less if

 

 

 

 

you're in a U.S. territory, in total wages.) If you don't check this box,

 

 

 

 

 

 

 

 

 

 

you must file Form 941 for every quarter

. . . . . .

15First date wages or annuities were paid (month, day, year). Note: If applicant is a withholding agent, enter date income will first be paid to

nonresident alien (month, day, year) . . . . . . . . . . . . . . . . .

16 Check one box that best describes the principal activity of your business.

Health care & social assistance

Wholesale—agent/broker

Construction

Rental & leasing

Transportation & warehousing

Accommodation & food service

Wholesale—other

Retail

Real estate

Manufacturing

Finance & insurance

Other (specify)

 

 

17Indicate principal line of merchandise sold, specific construction work done, products produced, or services provided.

18 Has the applicant entity shown on line 1 ever applied for and received an EIN?

Yes

No

If “Yes,” write previous EIN here

 

 

 

 

 

Complete this section only if you want to authorize the named individual to receive the entity’s EIN and answer questions about the completion of this form.

 

 

 

 

 

 

Third

Designee’s name

 

 

Designee’s telephone number (include area code)

Party

 

 

 

 

 

Designee

 

 

 

 

 

Address and ZIP code

 

 

Designee’s fax number (include area code)

 

 

 

Under penalties of

perjury, I declare that I have examined this application, and to the best of my knowledge and belief, it is true, correct, and complete.

Applicant’s telephone number (include area code)

 

Name and title (type or print clearly)

 

 

 

 

 

 

 

 

Applicant’s fax number (include area code)

 

Signature

Date

 

 

 

 

For Privacy Act and Paperwork Reduction Act Notice, see separate instructions.

Cat. No. 16055N

 

Form SS-4 (Rev. 12-2025) Created 10/17/25

 

Form SS-4 (Rev. 12-2025)

Page 2

See below to determine whether you need an EIN. However, for further information on applying for an EIN, including how to submit an EIN application, see the separate instructions at www.irs.gov/FormSS4.

Do I Need an EIN?

File Form SS-4 if the applicant entity doesn’t already have an EIN but is required to show an EIN on any return, statement, or other document.1 See also the separate instructions for each line on Form SS-4.

IF the applicant...

AND...

THEN...

 

 

 

started a new business

doesn’t currently have (nor expect to have)

complete lines 1, 2, 4a–8a, 8b–c (if applicable), 9a,

 

employees

9b (if applicable), 10–14, and 16–18.

 

 

 

hired (or will hire) employees,

doesn’t already have an EIN

complete lines 1, 2, 4a–6, 7a–b, 8a,

including household employees

 

8b–c (if applicable), 9a, 9b (if applicable), and 10–18.

 

 

 

opened a bank account

needs an EIN for banking purposes only

complete lines 1–5b, 7a–b, 8a, 8b–c

 

 

(if applicable), 9a, 9b (if applicable), 10, and 18.

 

 

 

changed type of organization

either the legal character of the organization or its

complete lines 1–18 (as applicable).

 

ownership changed (for example, you incorporate a

 

 

sole proprietorship or form a partnership)2

 

 

 

 

purchased a going business3

doesn’t already have an EIN

complete lines 1–18 (as applicable).

created a trust

the trust is other than a grantor trust or an IRA

complete lines 1–18 (as applicable).

 

trust4

 

created a pension plan as a

needs an EIN for reporting purposes

complete lines 1, 3, 4a–5b, 7a–b, 9a, 10, and 18.

plan administrator5

 

 

is a foreign person needing an

needs an EIN to complete a Form W-8 (other than

complete lines 1–5b, 7a–b (SSN or ITIN as applicable),

EIN to comply with IRS

Form W-8ECI), avoid withholding on portfolio assets,

8a, 8b–c (if applicable), 9a, 9b (if applicable), 10,

withholding regulations

or claim tax treaty benefits6

and 18.

 

 

 

is administering an estate

needs an EIN to report estate income on Form 1041

complete lines 1–7b, 9a, 10–12, 13–17 (if applicable),

 

 

and 18.

 

 

 

is a withholding agent for

is an agent, broker, fiduciary, manager, tenant, or

complete lines 1, 2, 3 (if applicable), 4a–5b, 7a–b, 8a,

taxes on nonwage income

spouse who is required to file Form 1042, Annual

8b–c (if applicable), 9a, 9b (if applicable), 10, and 18.

paid to an alien (that is,

Withholding Tax Return for U.S. Source Income of

 

individual, corporation, or

Foreign Persons

 

partnership, etc.)

 

 

 

 

 

is a state or local agency

serves as a tax reporting agent for public assistance

complete lines 1, 2, 4a–5b, 7a–b, 9a, 10, and 18.

 

recipients under Rev. Proc. 80-4, 1980-1 C.B. 5817

 

 

 

 

is a single-member LLC (or

needs an EIN to file Form 8832, Entity Classification

complete lines 1–18 (as applicable).

similar single-member entity)

Election, for filing employment tax returns and excise

 

 

tax returns, or for state reporting purposes8, or is a

 

 

foreign-owned U.S. disregarded entity and needs an

 

 

EIN to file Form 5472, Information Return of a 25%

 

 

Foreign-Owned U.S. Corporation or a Foreign

 

 

Corporation Engaged in a U.S. Trade or Business

 

 

 

 

is an S corporation

needs an EIN to file Form 2553, Election by a Small

complete lines 1–18 (as applicable).

 

Business Corporation9

 

1For example, a sole proprietorship or self-employed farmer who establishes a qualified retirement plan, or is required to file excise, employment, alcohol, tobacco, or firearms returns, must have an EIN. A partnership, corporation, REMIC (real estate mortgage investment conduit), nonprofit organization (church, club, etc.), or farmers’ cooperative must use an EIN for any tax-related purpose even if the entity doesn’t have employees.

2However, don’t apply for a new EIN if the existing entity only (a) changed its business name, (b) elected on Form 8832 to change the way it is taxed (or is covered by the default rules), or (c) terminated its partnership status because at least 50% of the total interests in partnership capital and profits were sold or exchanged within a 12- month period. The EIN of the terminated partnership should continue to be used. See Regulations section 301.6109-1(d)(2)(iii).

3Don’t use the EIN of the prior business unless you became the “owner” of a corporation by acquiring its stock.

4However, grantor trusts that don’t file using Optional Method 1 and IRA trusts that are required to file Form 990-T, Exempt Organization Business Income Tax Return, must have an EIN. For more information on grantor trusts, see the Instructions for Form 1041.

5A plan administrator is the person or group of persons specified as the administrator by the instrument under which the plan is operated.

6Entities applying to be a Qualified Intermediary (QI) need a QI-EIN even if they already have an EIN. See Rev. Proc. 2000-12.

7See also Household employer agent in the instructions. Note: State or local agencies may need an EIN for other reasons, for example, hired employees.

8See Disregarded entities in the instructions for details on completing Form SS-4 for an LLC.

9An existing corporation that is electing or revoking S corporation status should use its previously assigned EIN.

Click for IRS SS-4 File

File Breakdown

Fact Name Description
Purpose The IRS SS-4 form is used to apply for an Employer Identification Number (EIN), which is necessary for businesses to identify themselves for tax purposes.
Who Needs It Any business entity, including sole proprietorships, partnerships, corporations, and non-profits, may need to obtain an EIN using this form.
Filing Method The form can be submitted online, by mail, or by fax. Online applications are processed immediately, while other methods may take longer.
State-Specific Forms Some states may require additional forms or registrations. For example, California requires the Statement of Information (California Corporations Code Section 1502).
Deadline There is no specific deadline for filing the SS-4 form, but businesses should apply for an EIN before starting operations or hiring employees.

Guide to Using IRS SS-4

Once you've gathered the necessary information, you're ready to fill out the IRS SS-4 form. This form is crucial for obtaining an Employer Identification Number (EIN), which is essential for various business activities. Follow these steps carefully to ensure accuracy.

  1. Obtain the Form: Download the IRS SS-4 form from the IRS website or request a physical copy.
  2. Provide Basic Information: Enter your legal name and trade name (if applicable) in the designated fields.
  3. Entity Type: Check the box that corresponds to your business entity type, such as sole proprietorship, partnership, corporation, or LLC.
  4. Address: Fill in your business address. If you have a mailing address different from your business address, include that as well.
  5. Reason for Applying: Indicate why you are applying for an EIN. Common reasons include starting a new business or hiring employees.
  6. Date Business Started: Provide the date when your business was established.
  7. Number of Employees: Estimate the number of employees you expect to hire in the next 12 months.
  8. Principal Activity: Describe the main activity of your business in detail.
  9. Signature: Sign and date the form. Ensure that the person signing has the authority to do so.

After completing the form, review it for any errors or omissions. Once verified, you can submit it to the IRS either online, by mail, or by fax, depending on your preference and urgency. Keep a copy for your records, as this will be important for future reference.

Get Answers on IRS SS-4

What is the IRS SS-4 form?

The IRS SS-4 form is an application used to apply for an Employer Identification Number (EIN). This number is essential for businesses and organizations, as it serves as a unique identifier for tax purposes. The EIN is similar to a Social Security number, but it is specifically for business entities.

Who needs to fill out the SS-4 form?

Various entities may need to complete the SS-4 form, including:

  • Corporations
  • Partnerships
  • Limited liability companies (LLCs)
  • Sole proprietorships that have employees
  • Estates and trusts
  • Non-profit organizations

If you plan to hire employees or operate as a business entity, obtaining an EIN through the SS-4 form is typically necessary.

How do I apply for an EIN using the SS-4 form?

Applying for an EIN can be done in several ways:

  1. Online: The easiest method is to apply through the IRS website. This option is available for most applicants and provides immediate processing.
  2. By Mail: You can complete the SS-4 form and send it to the appropriate address listed on the IRS website. This method may take several weeks for processing.
  3. By Fax: If you prefer, you can fax the completed form to the IRS. This method usually results in faster processing than mail.
  4. By Phone: International applicants can apply by calling the IRS directly. However, this option is not available for domestic applicants.

What information do I need to provide on the SS-4 form?

When completing the SS-4 form, you will need to provide various pieces of information, including:

  • The legal name of the entity
  • The trade name (if applicable)
  • The entity's address
  • The name and Social Security number of the responsible party
  • The type of entity (e.g., corporation, partnership)
  • The reason for applying for an EIN

Having accurate information readily available will help streamline the application process.

Is there a fee to apply for an EIN using the SS-4 form?

No, there is no fee associated with applying for an EIN using the SS-4 form. The IRS provides this service free of charge. Be cautious of third-party services that may charge a fee to assist with the application process.

How long does it take to receive my EIN after submitting the SS-4 form?

The time it takes to receive your EIN depends on the method of application:

  • If you apply online, you will typically receive your EIN immediately.
  • For applications sent by fax, processing usually takes about four business days.
  • Mail applications can take up to four to six weeks for processing.

Planning ahead is essential, especially if you need the EIN for tax filings or hiring employees.

Can I amend information on my EIN after it has been issued?

Yes, if you need to make changes to your EIN information, you can do so. However, certain changes may require you to submit a new SS-4 form. For instance, if you change the structure of your business (e.g., from a sole proprietorship to a corporation), you will need a new EIN. For minor changes, such as an address update, you can simply notify the IRS.

What should I do if I lose my EIN?

If you lose your EIN, you can retrieve it in several ways:

  • Check previous tax returns or documents where the EIN may be listed.
  • Contact the IRS directly to request your EIN. You will need to provide identifying information to verify your identity.

Keeping a secure record of your EIN is advisable to avoid any complications in the future.

Where can I find the SS-4 form?

The SS-4 form is available on the IRS website. You can download it for free in PDF format. Additionally, the IRS website provides instructions and guidance on how to fill out the form correctly, which can be helpful for first-time applicants.

Common mistakes

Filling out the IRS SS-4 form can be a straightforward process, but mistakes are common. One frequent error occurs when applicants fail to provide a complete legal name for their business. The IRS requires the exact name as registered with the state. Omitting or misspelling this name can lead to delays in processing.

Another mistake is selecting the wrong type of entity. Many individuals do not fully understand the distinctions between different business structures, such as sole proprietorships, partnerships, and corporations. Choosing the incorrect entity type can result in complications with tax obligations and reporting requirements.

Inaccurate taxpayer identification numbers are also a common issue. Applicants sometimes enter a Social Security Number (SSN) or Employer Identification Number (EIN) that does not match IRS records. This inconsistency can cause significant delays in receiving the EIN, which is crucial for business operations.

Additionally, some individuals overlook the importance of providing a valid mailing address. The IRS uses this address for all correspondence. If the address is incorrect or incomplete, important documents may not reach the applicant, leading to missed deadlines and potential penalties.

Another frequent oversight involves failing to sign and date the form. The IRS requires a signature to validate the application. Without this, the form may be considered incomplete, and processing can be stalled.

Lastly, many people do not double-check their information before submission. Simple typographical errors can lead to significant issues down the line. Taking a moment to review the entire form can help ensure that all information is accurate and complete, ultimately facilitating a smoother application process.

Documents used along the form

The IRS SS-4 form is essential for obtaining an Employer Identification Number (EIN), which is necessary for various business activities. In addition to the SS-4 form, several other documents may be required or helpful during the application process or for related business needs. Below is a list of forms and documents that are often used alongside the SS-4.

  • Form 1040: This is the standard individual income tax return form used by U.S. taxpayers. It may be relevant for sole proprietors who need to report their business income on their personal tax returns.
  • Form 1065: Partnerships use this form to report income, deductions, gains, and losses from their operations. It is important for partnerships to file this form annually.
  • Form 1120: Corporations must file this form to report their income, gains, losses, deductions, and credits. It is crucial for C corporations to comply with federal tax requirements.
  • Form 941: Employers use this quarterly form to report income taxes, Social Security tax, and Medicare tax withheld from employee paychecks. It is vital for businesses with employees.
  • Form W-2: This form is issued by employers to report wages paid to employees and the taxes withheld. Employees use it to file their personal income tax returns.
  • Form W-9: This form is used by individuals and entities to provide their taxpayer identification number (TIN) to others who are required to report payments made to them. It is commonly used in business transactions.

Understanding these forms and their purposes can facilitate smoother interactions with the IRS and help ensure compliance with tax obligations. Each document plays a specific role in the overall process of business administration and tax reporting.

Similar forms

The IRS SS-4 form is used to apply for an Employer Identification Number (EIN). This form is similar to several other documents used in various business and tax contexts. Here are four documents that share similarities with the SS-4 form:

  • Form W-9: This form is used to provide taxpayer identification information to businesses or individuals who will be paying you. Like the SS-4, it collects essential identification details to facilitate tax reporting.
  • Form 1040: This is the standard individual income tax return form. While it serves a different purpose, both forms require personal information and are essential for tax compliance.
  • Form 941: This form is used to report income taxes, Social Security tax, and Medicare tax withheld from employee's paychecks. Similar to the SS-4, it is critical for businesses in managing their tax obligations.
  • Form 1065: This form is for partnerships to report income, deductions, gains, and losses. Both the SS-4 and Form 1065 are necessary for establishing and maintaining compliance with IRS regulations for business entities.

Dos and Don'ts

When completing the IRS SS-4 form, it’s essential to follow certain guidelines to ensure accuracy and avoid delays. Here’s a list of five things you should and shouldn’t do:

  • Do provide accurate information.
  • Do use the correct legal name of your business.
  • Do ensure that the form is signed by an authorized person.
  • Don't leave any required fields blank.
  • Don't submit the form without reviewing it for errors.

By adhering to these guidelines, you can help ensure a smoother application process for your Employer Identification Number (EIN).

Misconceptions

The IRS SS-4 form is an important document for anyone looking to obtain an Employer Identification Number (EIN). However, several misconceptions surround this form. Here are eight common misunderstandings:

  1. You only need the SS-4 form if you have employees. Many people believe that the SS-4 form is only necessary for businesses with employees. In reality, any business entity, including sole proprietors and partnerships, may need an EIN for tax purposes.
  2. Filing the SS-4 form is complicated. Some think that completing the SS-4 form is a daunting task. While it does require accurate information, the form is straightforward and can be filled out with basic details about your business.
  3. You cannot apply for an EIN online. A common myth is that the IRS does not allow online applications for an EIN. Actually, you can easily apply online through the IRS website, which is often the quickest method.
  4. The SS-4 form is only for new businesses. Many believe that only new businesses need to file this form. However, existing businesses may also need to apply for an EIN if they change their structure or ownership.
  5. There is a fee to file the SS-4 form. Some people think that submitting the SS-4 form comes with a cost. The truth is, applying for an EIN is free of charge.
  6. You can only apply for an EIN during business hours. Some assume that they can only submit the SS-4 form when the IRS office is open. In fact, you can apply online at any time, making it convenient for everyone.
  7. Once you get an EIN, you never need to worry about it again. While an EIN does not expire, businesses must keep their information up to date. If there are changes in ownership or structure, you may need to apply for a new EIN.
  8. Filing the SS-4 form guarantees tax benefits. Many believe that simply filing the SS-4 form will automatically provide tax advantages. However, obtaining an EIN does not guarantee any specific tax benefits; it is just a necessary step for tax identification.

Understanding these misconceptions can help you navigate the process of obtaining an EIN more effectively.

Key takeaways

Filling out the IRS SS-4 form is an important step for businesses and organizations seeking an Employer Identification Number (EIN). Here are key takeaways to keep in mind:

  1. Understand the Purpose: The SS-4 form is used to apply for an EIN, which is essential for tax reporting and business identification.
  2. Know When to Apply: You should fill out the SS-4 form when starting a new business, hiring employees, or changing the structure of your business.
  3. Gather Required Information: Before starting, collect necessary details such as your business name, address, and the responsible party’s information.
  4. Choose the Right Entity Type: The form requires you to indicate your business structure, like sole proprietorship, partnership, or corporation.
  5. Be Accurate: Double-check all entries for accuracy. Mistakes can lead to delays in processing your application.
  6. Submit Online or by Mail: You can apply for an EIN online through the IRS website, or you can mail the completed form to the appropriate address.
  7. Understand the Processing Time: If you apply online, you usually receive your EIN immediately. Mail applications may take longer.
  8. Keep Records: Once you receive your EIN, store it in a safe place. You will need it for tax filings and other business activities.
  9. Know the Fees: Applying for an EIN is free. Beware of third-party services that may charge a fee.
  10. Seek Help if Needed: If you have questions or need assistance, consider consulting a tax professional or contacting the IRS directly.

By following these takeaways, you can navigate the process of completing the SS-4 form with confidence and ease.