Where Can You Find Your Taxpayer ID Number?
To find a lost or misplaced Employer Identification Number or taxpayer identification number, view the computer-generated notice issued by the Internal Revenue Service during the application process, advises the IRS. Alternatively, contact the IRS to retrieve your EIN.
Look for your EIN on previously filed tax returns for your business, suggests the IRS. If this is not possible, contact the IRS via its Business & Specialty Tax Line to retrieve the number. The IRS requires identifying information to release an EIN via phone. Alternatively, contact your bank or a governmental agency that recorded your EIN when you applied for a business license.