Check your IRS confirmation letter for your EIN
Look at your previous business tax returns
Review bank account opening documents for your business
Check payroll or tax filing records
Contact your business accountant or tax preparer
Call the IRS Business and Specialty Tax Line at 800-829-4933
Search your business records for Form SS-4
Check any state or local business registration paperwork
Look in your business credit or loan documents
If you are an authorized party, request the EIN from the IRS by phone or mail