Check the company’s W-2, 1099, or other tax documents
Review the company’s tax returns or payroll records
Ask the company’s accounting or payroll department
Look on official business filings with the IRS or state agencies
Search the SEC filings if the company is publicly traded
Contact the IRS Business & Specialty Tax Line
Use the IRS EIN verification tools if you are an authorized party
Check business licenses, permits, or loan documents
Search the company’s website or public vendor documents
Request the EIN directly from the business owner or authorized representative