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Who files Form 1120-S?

Any corporation that has made a valid S Corporation election with the IRS by filing Form 2553 and whose election remains in effect files Form 1120-S every year. If you have filed Form 1120-S in prior years, you continue to file it unless the S Corp election has been terminated.

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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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