How do I get a copy of my Form SS-4 to confirm my business information?

Accessing your tax documents is handled by the IRS directly. You can request a replacement copy by calling the IRS Business and Specialty Tax Line. The phone number is (800) 829-4933, and the line is open from 7 a.m. to 7 p.m., taxpayer local time, Monday through Friday. The tax specialist will ask you to provide your Employer Identification Number (EIN) and some identifying information about your business.