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When is Form 1040 due?

April 15 for most individuals. A six-month extension to October 15 is available by filing Form 4868 before April 15. US citizens living abroad receive an automatic extension to June 15 without needing to file separately, but interest accrues on any unpaid tax from April 15.

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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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