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USIRSRev. 12/2023

Official form guide

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

Form SS‑4 is the IRS Application for Employer Identification Number (EIN). Use it to request a new EIN for a business, estate, trust, nonprofit, or other entity that needs a tax ID.

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Form Overview

IRS Form SS-4 - Application for Employer Identification Number (EIN)

Form SS‑4 is the IRS Application for Employer Identification Number (EIN). Use it to request a new EIN for a business, estate, trust, nonprofit, or other entity that needs a tax ID.

The form collects legal name, address, entity type, reason for the EIN, responsible party’s SSN/ITIN, and expected tax filing activity.

Risk Radar

Scan points
  • 1A single typo can postpone EIN issuance by weeks.
  • 2Wrong responsible party SSN/ITIN
  • 3Mis‑classifying entity type
  • 4Incorrect mailing address
  • 5Leaving the “reason for applying” blank

Plain English

An EIN works like a Social Security number for a business. You fill out SS‑4 to get one when you start a company, open a bank account, hire employees, or file certain tax returns.

Submission Date

  • Filing date: File as soon as the entity is formed or when a new EIN is required; there is no statutory deadline, but many processes (bank accounts, payroll) wait for the EIN.
  • Preparation window: collect IDs, supporting records, and signatures in advance.
  • Final review: verify names, dates, and required fields before submission.

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Glossary Terms

identificationentityparty

Hover a term to preview the meaning.

What this form is for

  • Use SS‑4 when you need a new EIN for a brand‑new entity.
  • Do not use it to change an existing EIN; file Form 8822‑B instead.
  • If you are a sole proprietor without employees, you may not need an EIN.

Form selector

Use this form or another form?

Changing address after EIN issuance

Updates IRS records

✓ Verify old EIN stays same

Form 8822‑B

Applying for an EIN for a foreign entity with no US address

Requires ITIN for responsible party

✓ Check treaty rules

Form SS‑4 (with special instructions)

Converting a sole proprietorship to an LLC

New entity type requires new EIN

✓ Confirm state registration first

Form SS‑4 (new EIN)

Deadline or filing window

There is no fixed filing deadline for an EIN, but many downstream actions (bank account opening, payroll setup) require the number before they can proceed. Obtain the EIN promptly after entity formation.

Checklist

What you need before filling it out

1

Legal name of entity

Articles of incorporation, trust agreement, or DBA filing · Formation documents

⚠ Misspelled name causes mismatch✕ High
2

Responsible party SSN/ITIN

Social Security card or ITIN notice · Personal ID

⚠ Transposed digits✕ High
3

Entity classification

IRS instructions, state registration · Formation paperwork

⚠ Wrong box selected✕ Medium
4

Reason for EIN

Business plan, payroll schedule · Internal memo

⚠ Blank or vague description✕ Low

Before you submit

  1. 1Confirm form edition is 2024
  2. 2Verify responsible party SSN/ITIN matches official record
  3. 3Check entity classification matches legal documents
  4. 4Ensure address is complete (street, city, state, ZIP)
  5. 5Enter a valid phone number
  6. 6Select appropriate reason for EIN request
  7. 7Sign the paper copy if filing by mail or fax
  8. 8If filing online, capture the confirmation number
  9. 9Retain a copy of the completed SS‑4 for your records

How to file this form

  1. 1Gather formation documents and responsible party ID
  2. 2Access the online SS‑4 application at IRS.gov
  3. 3Enter data field‑by‑field, using drop‑down menus for entity type
  4. 4Review each entry for accuracy
  5. 5Submit electronically and record the EIN immediately
  6. 6If using paper, mail or fax to the address in the instructions
  7. 7Keep the acknowledgment receipt

Known limitations

  1. 1Online system may be unavailable during peak periods
  2. 2Paper processing time varies by region
  3. 3Form does not validate foreign address formats automatically
  4. 4IRS does not provide real‑time error correction for faxed submissions

Field map

Compact field-by-field guide

9 fields

Entity

5 items

Legal Name of Entity

The legal name exactly as filed with the state or as it appears on legal documents.

Requiredtext
Trade Name (DBA)

Doing business as name, if different from legal name.

text
Responsible Party Name & SSN/ITIN

The individual who controls, manages, or directs the entity. Must provide their SSN or ITIN.

Requiredtext
Mailing Address

Where IRS correspondence will be sent.

Requiredtext
Type of Entity

Sole proprietor, partnership, corporation, S-corp, LLC, trust, estate, etc.

Requiredselect

Reason

1 items

Reason for Applying

Started a new business, hired employees, banking purposes, changed type of organization, etc.

Requiredtext

Business

3 items

Date Business Started

Date the entity was formed or started operating.

Requireddate
Principal Business Activity

Describe the primary type of product or service.

Requiredtext
Number of Employees Expected in Next 12 Months

If hiring, provide expected headcount to determine filing requirements.

text

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Current form status
IRSRev. 12/2023

The IRS issues the EIN instantly when the form is filed online. Paper or fax submissions may take 4‑6 weeks.

What changed or needs a fresh check

  • Edition date – verify the form is the 2024 revision
  • Fee – none, IRS does not charge for an EIN
  • Mailing address – use the address listed for paper filings in the current instructions
  • Fax number – confirm current fax line for your region
  • Online portal URL – https://www.irs.gov/businesses/small-businesses-self-employed/apply-for-an-employer-identification-number-ein-online

Form Preview

Form SS-4 page 1

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Quick Facts

Any person or entity that must have an EIN files this form.
The form collects legal name, address, entity type, reason for the EIN, responsible party’s SSN/ITIN, and expected tax filing activity.
File as soon as the entity is formed or when a new EIN is required; there is no statutory deadline, but many processes (bank accounts, payroll) wait for the EIN.
Submit online at IRS.gov, by fax, or by mail to the address listed in the SS‑4 instructions. Online is fastest.
Incorrect information can delay EIN issuance, cause mismatched tax records, or trigger IRS notices.
1. Gather legal name, formation documents, and responsible party SSN/ITIN. 2. Choose the correct entity classification. 3. Complete the online SS‑4 wizard or fill the PDF. 4. Review for typos, especially the responsible party SSN and address. 5. Submit electronically for immediate EIN, or fax/mail if required.

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After you file

  1. 1Save the EIN confirmation letter or electronic notice
  2. 2Update the EIN on all tax registrations and bank accounts
  3. 3Record the EIN in your accounting software
  4. 4Notify state tax agencies if required
  5. 5Store formation documents and SS‑4 together for audit purposes
  6. 6Monitor IRS correspondence for any follow‑up requests

Sources

  • SRCIRS SS‑4 instructionsconfirms purpose and data fields
  • SRCIRS websiteonline EIN application process
  • SRCIRS Publication 1635EIN basics
  • SRCIRS Form 8822‑Baddress change guidance
  • SRCIRS Form 147CEIN correction procedure
  • SRCNot found in provided sourcedeadline specifics for EIN issuance

Common confusion points

EIN vs. SSN

Many think they are interchangeable

→ Verify the entity needs a tax ID

Responsible party vs. owner

The responsible party is the person who controls the entity

→ Check who the IRS defines as responsible

Sole proprietor EIN need

Some think it’s always required

→ Only needed for payroll, certain excise taxes, or banking

Foreign entity address

Form asks for a US address

→ Use a US mailing agent or the address of a US representative

Changing EIN after formation

Some assume you can reuse an old EIN

→ New entity types require a new EIN

Workflow map

Related forms and next steps

4 signals

Before

Form 1023 (nonprofit application) – may need EIN first

Current

SS-4

After

Form 1120 (corporate tax return) – reports EIN

Often used with

Form 941 (quarterly payroll) – requires EIN

⚠ If something goes wrong

  • Form 147C (request for EIN correction) – to fix errors

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Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
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