SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/biz-sole-prop-ein-rules

If a sole proprietor needs an EIN, how many cover multiple businesses and trade names?

Just one. One EIN generally covers all of that owner's sole-proprietor businesses.

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  1. One per trade name
  2. Just one ✔
  3. None, ever

Why: IRS instructions say a sole proprietor files only one Form SS-4 and needs only one EIN, regardless of the number of businesses or trade names. Incorporating or forming a partnership requires a new EIN.

Huh, didn't know that: A sole proprietor with no employees often uses their Social Security number; hiring employees is a common reason to get an EIN.

The dad joke
Why did three shops share one number? Their sole proprietor knew how to count costs.
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References

Answer: Just one. IRS instructions say a sole proprietor files only one Form SS-4 and needs only one EIN, regardless of the number of businesses or trade names. Incorporating or forming a partnership requires a new EIN.

  1. IRS: Instructions for Form SS-4 www.irs.gov/instructions/iss4
    a sole proprietor should file only one Form SS-4 and needs only one EIN, regardless of the number of businesses
    Checked 2026-10-11.

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