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Deposit payroll tax for payments on Apr 10-12 if the semiweekly deposit rule applies.

Earlier 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.
Later Event: April 18
EFTPS users: Payments must be scheduled by 8 PM ET at least one calendar day before the tax due date.