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SESK: Stuff Everyone Should Know · sesk.info/biz-form-ss4

Which IRS form is the application for an EIN?

Form SS-4.

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  1. Form SS-4 ✔
  2. Form W-4
  3. Form 8832

Why: Form SS-4 is the application for an Employer Identification Number. The EIN is a 9-digit number like 12-3456789, used by employers, sole proprietors, corporations, partnerships and others.

Huh, didn't know that: Changes to your responsible party must be reported to the IRS within 60 days on Form 8822-B.

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References

Answer: Form SS-4. Form SS-4 is the application for an Employer Identification Number. The EIN is a 9-digit number like 12-3456789, used by employers, sole proprietors, corporations, partnerships and others.

  1. IRS: About Form SS-4 www.irs.gov/forms-pubs/about-form-ss-4
    Use Form SS-4 to apply for an employer identification number (EIN).
    Checked 2026-10-11.

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