SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/biz-ein-mail-timing

If you apply for an EIN by mail, how early should you send Form SS-4?

At least 4 weeks before you need the number.

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  1. 2 days ahead
  2. 6 months ahead
  3. At least 4 weeks ahead ✔

Why: IRS Publication 583 says to mail Form SS-4 at least 4 weeks before you need an EIN. By fax it takes about 4 business days, and online it's immediate.

Huh, didn't know that: If the EIN hasn't arrived when a return is due, the IRS says file anyway and write "Applied For".

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References

Answer: At least 4 weeks ahead. IRS Publication 583 says to mail Form SS-4 at least 4 weeks before you need an EIN. By fax it takes about 4 business days, and online it's immediate.

  1. IRS Publication 583, Starting a Business and Keeping Records www.irs.gov/publications/p583
    If you apply by mail, file Form SS-4 at least 4 weeks before you need an EIN.
    Checked 2026-10-11.

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