Check the company’s W-2, 1099, or other tax forms if you are authorized to access them
Ask the employer’s payroll or accounting department
Review the company’s official tax documents or business filings
Search the SEC filings if the company is publicly traded
Look up state business registration records
Check the company’s website for tax or vendor information
Contact the IRS if you are an authorized representative
Use a paid business information database
Search nonprofit IRS records if the organization is a nonprofit
Request the EIN directly from the business if you need it for legitimate purposes