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IRS Form SS-4 (EIN application)

Fax Form SS-4 to apply for an Employer Identification Number when you cannot apply online. If you include a return fax number, the IRS can fax the EIN back in about four business days.

Sign the form by hand before faxing. The IRS Fax-TIN line is only for EIN applications.

What to include

Sign Form SS-4 by hand. This line is only for EIN applications. Put a return fax number on the form if you want the EIN faxed back, which the IRS says takes about four business days.

For the cover sheet, see the tax documents FAQ.

Fax numbers

Always re-check the source before a deadline. Agencies change fax numbers without notice.