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SS-4 Form

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SS-4: Application for Employer Identification Number (EIN)

1. Legal name of entity (or individual)

2. Mailing address

3. Street address (if different)

4. Responsible party

Name of responsible party:

Title of responsible party:

Social security number or ITIN of responsible party:

5. Type of entity

Select the entity type (select only one):

6. If LLC, number of members and tax classification

Number of LLC members:

LLC tax classification (check one):

7. Reason for applying for an EIN

Please indicate the principal reason (select the most applicable):

8. Date business started or acquired

Start date:

9. Highest number of employees expected in next 12 months

Agricultural: Household: Other:

10. Principal activity and primary product or service

11. Previous EIN

Have you ever applied for an EIN before?

12. Taxpayer identification

Provide the applicant's Taxpayer Identification Number if available (enter Social Security Number or existing EIN):

13. Third party designee

Do you want to authorize a third party to receive the EIN and answer questions about this application?

Certification

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. I further certify the following numbered statements apply to this application:

  1. That the entity named on this application is the correct applicant for the Employer Identification Number requested.
  2. That the person signing below is the responsible party authorized to execute this application on behalf of the applicant and is authorized to provide the information contained herein.
  3. That the information provided will be used for federal tax administration purposes and that false statements are punishable by fines or imprisonment as prescribed by law.

Signature below constitutes certification of the statements above and acknowledgement that the applicant understands applicable penalties for willful misstatement.

Applicant Signature

Applicant Name:

Signature:

Title:

Date:

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What the SS-4 Form Is and when it’s used

The SS-4 Form is the Internal Revenue Service's application for an Employer Identification Number (EIN), a unique nine-digit tax identification number used to identify business entities and certain trusts, estates, and nonprofit organizations for federal tax purposes. Entities use an EIN to open bank accounts, hire employees, file employment and excise tax returns, and fulfill reporting obligations. The IRS accepts Form SS-4 by online EIN application, mail, fax, and by telephone for international applicants; processing timelines and required attachments vary by submission method and entity type.

Why an EIN matters for your business

The SS-4 establishes a legal tax identity for a business or other entity, enabling payroll reporting, banking, vendor accounts, and federal tax filings. Obtaining an EIN separates business and personal tax responsibilities and is often required to hire employees, open commercial bank accounts, and file information returns.

Why an EIN matters for your business

Who typically completes the SS-4 Form

Common applicants include corporations, LLCs, partnerships, estates, trusts, and nonprofits that require a federal taxpayer identification number.

  • New corporations and LLCs applying for an EIN to hire employees or open business bank accounts
  • Sole proprietors who need an EIN for payroll, retirement plans, or vendor relationships
  • Estates, trusts, nonprofits, and government entities filing returns or reporting withholding

Verify the entity classification and responsible party information before filing: the IRS uses those selections to determine reporting obligations and correspondence routing.

Core elements to include on a professional SS-4

A complete SS-4 includes accurate entity details, responsible party ID, EIN purpose, and business activity codes to minimize processing delays.

Entity name

Enter the legal name exactly as registered with state or as it appears on formation documents to avoid mismatches and processing delays.

Trade name

If using a DBA or trade name, record it so the EIN links to the business's public-facing identity and banking correspondence.

Responsible party

Provide the name and taxpayer identification (SSN or ITIN) of the person with control over funds and assets; accurate ID is required under IRS rules.

Type of entity

Select the correct entity type (corporation, partnership, sole proprietor, LLC, trust, estate) and indicate single-member LLC classification when applicable.

Reason for applying

Specify why the EIN is requested (banking, hiring, pension plan, withholding agent, estate administration) to assist IRS routing.

Business activity code

Enter the six-digit principal activity code that best describes primary operations; use IRS instructions to choose the most accurate code.

Required data fields at a glance

Legal name: Legal name as on formation documents
Trade name: DBA or Doing Business As name (if any)
Responsible party TIN: SSN or ITIN of the responsible party
Mailing address: Street, city, state, and ZIP
Entity type: Corporation, LLC, partnership, trust, etc.
Reason for EIN: Banking, hiring, estate, withholding, etc.

Step-by-step: complete and submit Form SS-4

Follow these sequential steps to prepare and submit the SS-4 and obtain an EIN from the IRS.

  • 01
    Gather documents: Collect formation papers and taxpayer IDs.
  • 02
    Complete form: Fill each line per IRS instructions.
  • 03
    Choose submission method: Select online, fax, or mail based on eligibility.
  • 04
    Record EIN: Retain EIN and confirmation for records.

Configuring an online SS-4 workflow

Configure an e-filing workflow to collect SS-4 data, authenticate signers, and attach supporting documentation before submission.

Field Configuration
Field mapping Map PDF fields to database columns.
Conditional fields Show fields when specific entity types chosen.
Signer authentication Use email, SMS, or stronger ID verification.
Attach documents Include formation documents and taxpayer ID copies.

Where and how to file the SS-4

Choose the IRS filing channel that fits your situation: online for immediate EINs, fax for expedited paper processing, or mail when required.

  • Online: Use the IRS EIN online application for immediate issuance when eligible.
  • Fax: Fax completed SS-4 to the IRS fax number for expedited processing.
  • Mail: Mail the signed SS-4 to the appropriate IRS address for paper submissions.
  • International: Call the IRS international number to apply by phone.

Digital signing and secure eSubmission for the SS-4

Digital completion requires secure eSignature, file export as PDF, and a verifiable audit trail to support IRS recordkeeping.

  • File formats: PDF and DOCX supported
  • Authentication: Email, SMS, KBA options
  • Integrations: Works with common storage and CRM platforms

Processing expectations and timing

Processing timelines for Form SS-4 depend on submission method; online applications typically yield an EIN immediately, while paper or fax methods require IRS processing time.

Online filing:

EIN issued immediately upon successful submission.

Fax filing:

Processing by IRS may take several business days.

Mail filing:

Mail submissions processed on IRS schedule; expect longer delays.

International phone:

International applicants receive EIN via phone during call.

Recordkeeping:

Keep confirmation notice as proof of EIN assignment.

Key risks and penalties when the SS-4 is incorrect

Delays in processing: IRS may delay EIN assignment
Wrong TIN: May trigger 24% backup withholding
Incorrect entity: Misclassification affects tax treatment
Information return penalties: Penalties apply under IRC §6721
Unable to open accounts: Banks require EIN and may reject application
Corrective filings: Requires amended forms and correspondence

Real-world examples of SS-4 use in practice

Two brief examples show how organizations manage EIN requests and store the confirmation for operational and compliance purposes.

Martin Properties — Tim Martin, Founder

Tim Martin needed an EIN to open entity bank accounts and process tenant payments.

  • Mobile and offline signing supported for field teams.
  • He reports processing and executing documents online with compliance and built-in security, which reduced turnaround for formation and vendor onboarding.

Fertility Centers of Illinois — John Butler, Founder

The clinic required EINs for payroll and provider tax reporting across several locations.

  • Cloud-based forms simplified central collection.
  • The organization cited API flexibility and responsive support that helped secure remote completion and consistent record retention for audits.

eSignature pricing and feature comparison for handling SS-4 forms

Compare common eSignature plan attributes relevant when collecting and storing SS-4 forms electronically; signNow is listed first for reference.

signNow DocuSign Adobe Sign PandaDoc HelloSign
Starting Price $8/user/mo $15/user/mo $14/user/mo $19/user/mo $15/user/mo
Free Trial Yes, 7-day trial No No Yes, limited Yes, limited
Bulk Send Yes Yes Yes Yes No
Audit Trail Yes Yes Yes Yes Yes
HIPAA Compliant Yes Yes Yes No No

Frequently asked questions about the SS-4 and EIN issuance

Answers to common questions about eligibility, submission methods, errors, and electronic signatures to reduce confusion and avoid delays with the IRS.


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