I first wrote about this issue more than four years ago (Foreign Company Alert: Obtaining an EIN may be your Biggest Challenge in the U.S. - The High-touch Legal Servicesu00ae Blog...for Startups!).Quoting from that post (the following replaces my original answer to this Q):Update: Effective January 6, 2023. the Internal Revenue Service implemented a new cost-saving procedure that, unfortunately, extends the time that I require to obtain an EIN for my international clients by several days (by fax after one week rather than by telephone in real time). The new procedure is reflected below.Retain a lawyer, or another qualified individual, to act as the third party designee for the corporation.The designee should prepare Form SS-4 (Application for Employer Identification Number) and Form 8821 (Tax Information Authorization) for the corporationu2019s president to sign and return.The designee faxes the signed Forms SS-4 and 8821 to the Internal Revenue Service at +1 859-669-5760.Approximately one week later, the IRS faxes an EIN confirmation letter to the designee.