Required if US corporation did any reportable transactions at any time during tax year AND has any 25%+ foreign shareholder. See here https://www.irs.gov/instructions/i5472
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Required if US corporation did any reportable transactions at any time during tax year AND has any 25%+ foreign shareholder. See here https://www.irs.gov/instructions/i5472
Check your EIN confirmation letter (CP 575) first. If that is gone, look at a previously filed tax return, a business bank account application, or any 1099 you have issued. Your bank or your payroll provider will also have it on file.