March 15 for calendar-year partnerships. If you filed for a six-month extension using Form 7004, the extended deadline is September 15. There is no further extension available after that date.
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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.
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