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Deadline Notice

If a calendar-year C corporation, file a 2017 income tax return (Form 1120) or file for an automatic six-month extension (Form 7004), and pay any tax due. If the return isn’t extended, this is also the last day to make 2017 contributions to pension and profit-sharing plans.

If a calendar-year C corporation, pay the first installment of 2018 estimated income taxes.

Earlier Event: April 17
Tax Notice
Later Event: April 30
Deadline Notice