Foreign corporations conducting business in California must file Form 100 if they earn income from sources within the state.
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Foreign corporations conducting business in California must file Form 100 if they earn income from sources within the state.
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.