September 17 - S Corporations
File a 2017 calendar year income tax return (Form 1120S) and pay any tax due. This due date applies only if you requested an automatic 6-month extension. Provide each shareholder with a copy of K-1 (Form 1120S) or a substitute Schedule K-1.
September 17 - Corporations
Deposit the third installment of estimated income tax for 2018 for calendar yearSeptember 17 - Social Security, Medicare and withheld income tax
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