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Corporations: Deposit the first installment of your 2019 estimated tax.

Earlier Event: April 15
Individuals: File Form 1040. For automatic 6-month extension file Form 4868 and deposit estimated tax. Pay the first installment of 2019 estimated tax - Use Form 1040-ES.
Later Event: April 15
Corporations: File Form 1120 for calendar year and pay any tax due. For automatic 6-month extension, file Form 7004 and deposit estimated tax.